Thanks.
Fiddling with xrandr and the freshly installed edid-decode tool:
Gamma: 1.0:1.6:2.8
My gosh, regarding the EDID decoding, “human-readable” is a relative concept I guess. 
Decoded EDID
Block 0, Base EDID:
EDID Structure Version & Revision: 1.3
Vendor & Product Identification:
Manufacturer: DWE
Model: 566
Serial Number: 20000080
Made in: week 32 of 2017
Basic Display Parameters & Features:
Digital display
Maximum image size: 52 cm x 30 cm
Gamma: 2.20
DPMS levels: Off
RGB color display
Default (sRGB) color space is primary color space
First detailed timing is the preferred timing
Color Characteristics:
Red : 0.6484, 0.3388
Green: 0.2822, 0.6025
Blue : 0.1425, 0.0703
White: 0.3134, 0.3291
Established Timings I & II:
IBM : 720x400 70.081663 Hz 9:5 31.467 kHz 28.320000 MHz
DMT 0x04: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
DMT 0x05: 640x480 72.808802 Hz 4:3 37.861 kHz 31.500000 MHz
DMT 0x06: 640x480 75.000000 Hz 4:3 37.500 kHz 31.500000 MHz
DMT 0x08: 800x600 56.250000 Hz 4:3 35.156 kHz 36.000000 MHz
DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz
DMT 0x0a: 800x600 72.187572 Hz 4:3 48.077 kHz 50.000000 MHz
DMT 0x0b: 800x600 75.000000 Hz 4:3 46.875 kHz 49.500000 MHz
Apple : 832x624 74.551266 Hz 4:3 49.726 kHz 57.284000 MHz
DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz
DMT 0x11: 1024x768 70.069359 Hz 4:3 56.476 kHz 75.000000 MHz
DMT 0x12: 1024x768 75.028582 Hz 4:3 60.023 kHz 78.750000 MHz
DMT 0x24: 1280x1024 75.024675 Hz 5:4 79.976 kHz 135.000000 MHz
Standard Timings:
DMT 0x15: 1152x864 75.000000 Hz 4:3 67.500 kHz 108.000000 MHz
DMT 0x23: 1280x1024 60.019740 Hz 5:4 63.981 kHz 108.000000 MHz
DMT 0x1c: 1280x800 59.810326 Hz 16:10 49.702 kHz 83.500000 MHz
DMT 0x2f: 1440x900 59.887445 Hz 16:10 55.935 kHz 106.500000 MHz
DMT 0x3a: 1680x1050 59.954250 Hz 16:10 65.290 kHz 146.250000 MHz
DMT 0x30: 1440x900 74.984427 Hz 16:10 70.635 kHz 136.750000 MHz
DMT 0x20: 1280x960 60.000000 Hz 4:3 60.000 kHz 108.000000 MHz
GTF : 1280x960 74.999884 Hz 4:3 75.150 kHz 129.859000 MHz
Detailed Timing Descriptors:
DTD 1: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz (521 mm x 293 mm)
Hfront 88 Hsync 44 Hback 148 Hpol P
Vfront 4 Vsync 5 Vback 36 Vpol P
DTD 2: 1600x900 60.259755 Hz 16:9 55.921 kHz 119.000000 MHz (521 mm x 293 mm)
Hfront 96 Hsync 168 Hback 264 Hpol P
Vfront 1 Vsync 3 Vback 24 Vpol P
Display Range Limits:
Monitor ranges (GTF): 56-75 Hz V, 30-81 kHz H, max dotclock 180 MHz
Display Product Name: 'EM2470W'
Extension blocks: 1
Checksum: 0xa6
----------------
Block 1, CTA-861 Extension Block:
Revision: 3
Basic audio support
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
Native detailed modes: 7
Video Data Block:
VIC 1: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz (native)
VIC 3: 720x480 59.940060 Hz 16:9 31.469 kHz 27.000000 MHz (native)
VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz (native)
VIC 5: 1920x1080i 60.000000 Hz 16:9 33.750 kHz 74.250000 MHz (native)
VIC 19: 1280x720 50.000000 Hz 16:9 37.500 kHz 74.250000 MHz (native)
VIC 20: 1920x1080i 50.000000 Hz 16:9 28.125 kHz 74.250000 MHz (native)
VIC 31: 1920x1080 50.000000 Hz 16:9 56.250 kHz 148.500000 MHz (native)
Audio Data Block:
Linear PCM:
Max channels: 8
Supported sample rates (kHz): 192 96 48 44.1 32
Supported sample sizes (bits): 24 20 16
Speaker Allocation Data Block:
FL/FR - Front Left/Right
LFE1 - Low Frequency Effects 1
FC - Front Center
BL/BR - Back Left/Right
RLC/RRC - Rear Left/Right of Center (Deprecated)
Vendor-Specific Data Block (HDMI), OUI 00-0C-03:
Source physical address: 1.0.0.0
Supports_AI
Detailed Timing Descriptors:
DTD 3: 720x480 59.940060 Hz 3:2 31.469 kHz 27.000000 MHz (531 mm x 398 mm)
Hfront 16 Hsync 62 Hback 60 Hpol N
Vfront 9 Vsync 6 Vback 30 Vpol N
DTD 4: 1920x1080i 59.943434 Hz 16:9 33.718 kHz 74.180000 MHz (708 mm x 398 mm)
Hfront 88 Hsync 44 Hback 148 Hpol P
Vfront 2 Vsync 5 Vback 15 Vpol P Vfront +0.5 Odd Field
Vfront 2 Vsync 5 Vback 15 Vpol P Vback +0.5 Even Field
DTD 5: 1280x720 50.000000 Hz 16:9 37.500 kHz 74.250000 MHz (708 mm x 398 mm)
Hfront 440 Hsync 40 Hback 220 Hpol P
Vfront 5 Vsync 5 Vback 20 Vpol P
DTD 6: 720x480 59.940060 Hz 3:2 31.469 kHz 27.000000 MHz (531 mm x 398 mm)
Hfront 16 Hsync 62 Hback 60 Hpol N
Vfront 9 Vsync 6 Vback 30 Vpol N
DTD 7: 720x480 59.940060 Hz 3:2 31.469 kHz 27.000000 MHz (708 mm x 398 mm)
Hfront 16 Hsync 62 Hback 60 Hpol N
Vfront 9 Vsync 6 Vback 30 Vpol N
Apparently the name is EM2470W. Gemini started by saying that it was “a TN (Twisted Nematic) panel”, but when challenged to give me sources it admitted that it had no idea. 
I then tried giving it the name that LDLC used when re-branding the monitor (yeah, they print their own name on some random Asian monitor for some reason), found on the invoice, and it found a source this time. Apparently it’s a derivative from IPS, so at least the guy from the LDLC shop wasn’t lying to me I guess.
Still, it was in 2019, and it seems that monitors nowadays can be much better for the same price. 
IPS seems to gradually get closer to true blacks, too. Might be worth upgrading, calibration or not.
Thanks!
Yeah but I kinda shot myself in the foot with random-hour shooting and by assuming that I should avoid blown-out skies as much as possible. It turns out that shadows, even non-clipped, often retain some kind of ugliness when you try to salvage them. Well, it’s by shooting that you learn, I guess.