A quick check of disabling the module did not seem to make any difference. It is set to clip highlights.
Could it be a combination of highlight reconstruction and CA?
Not using CA.
After zooming in and looking closely, it appears to me that there is a structure of some kind, perhaps a walkway, back there. The color that appeared comes from it, so it is real.
I come late to this 
Besides my Nikons I also have an Oly (EM5 II) and I am shocked, how much the noise has been improved. For me, I need to denoise already beginning with 200ISO and here I literally see nothing at 640.
This is my take with darktable 3.3.0+1707~g696fc5c4a
P9120141.orf.xmp (11,1 KB)
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With two month’s more experience with dt 3.2.1, I think I have improved since my earlier post. I have learned to deal with the highlights reconstruction since then, and I am more comfortable with the exposure. I think I have a better balanced interpretation, now.
P9120141.orf.xmp (5.4 KB)
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Yes you did, noticeably. I like how you consistently edit to keep it as real as possible and I do not think that that is a lack of knowledge. Many, including myself, tend to over saturate or emphasize certain parts at times. This is also true for sharpening, although I do have to say that the above image seems to lack some in that respect 
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Thank you.
Yes, I do not really have any grasp on sharpening in dt, as of yet. I get completely lost trying to read the current/recent thread on sharpening. I guess I should start it again, from the top.
PS - When I used to do a lot of editing with the GIMP, a few years ago, I was even to the point of building my own overlay masks for contrast and sharpening. But, I have forgotten 85% of all that.
Sorry I keep bumping, I didn’t used darktable in a long time and I’m practicing filmic
dt 3.2.1
P9120141.orf.xmp (13.0 KB)
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honestly you can usually get great results just by opening up the contrast equalizer and making a little kick like this with a large “brush” size:
sometimes its worth using the parametric mask to keep the effect out of the highlights and shadows a bit, but this alone gets you 95% of the way there most of the time.
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@Eduardo_Battaglia That is a lot of food colouring there! 
I didn’t really notice the upwards arrow until now. Now I can’t avoid seeing it. 
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LOL thanks, now I see it too. 
Goig for a sunny, late afternoon look, with more yellowish greens
DT 3.5
P9120141.orf.xmp (13.2 KB)
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Nice location!
Testing @jandren’s sigmoid and @anon41087856’s rebooted colour balance.
Tried not to overdo it.
dt 3.5.0
P9120141_02.orf.xmp (12.3 KB)
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the colors are realistic, the water is this green
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Oh, cool, was just a guess, peeking to the other results. My starting point was here:
Some tweaking in sigmoid and colour calibration shifted it into the right direction. Lifting brilliance and saturation / chroma was done with the colour balance modules.
I think you are right and the lack of the intense colour is caused by the shadow in the canyon rsp. the absence of direct sunlight on the river.