That looks pretty nice. I'll try to find some noisy files to send to you. What's nice about Darktable is it has a feature called "profiled denoise".
Contributors send in calibrated RAW files per camera, taken at every ISO setting possible, so Darktable denoises your file according to your camera's profile at particular ISO. The result is pretty impressive.
I have uploaded that particular image to [0]. Taken in 2006 and processed in 2020, after 14 years!
https://www.dxo.com/fr/technology/deepprime/
I have a license for some older version, if you want to throw a .nef at me