I did look at this image and I also didn’t find a clear difference in the handling of ART and DT. So, same results here.
Of course I did some further (ongoing) testing and I think that you need a tack sharp image to begin with. Because the “blows me away”-effect is something like a sub pixel thing - comparable to antialising on/off or just a tiny bit more resolution. So bringing sharpness into play was probably not very helpful.
Another picture where I found this effect visible, is this one:
https://discuss.pixls.us/t/bee-macro-always-having-trouble-with-colors-in-darktable-especially-macros-sony-a6400
Take a look at my screenshot
(must look at 100%!)
If I needed to describe, what I’m seeing, I would call it more clean in ART or (as I said) a bit more resolution, despite both being the same picture at 100%.