For all anyone knows they did, Windows 10 emulation of older DirectX (i think its 8 and below for Emu) vs 9.1c was doggy enough.
Ive run this on a AMD GPU (Ryzen) and a 6700XT and ran smoothly. had to play with the dxcfg. This was a NEW windows 10 21H2 and latest drivers.
GoG cant expect to check every drivers/GFX/APU under the sun, theres a ton of people with nVidia cards having problems, as ive helped a couple myself.
I've noticed some people have a old windows setups (originally Upgraded from 7 or 8 then 10 and various backwards builds). Basically had to reinstall with fresh win 10 and patch and then worked OK.
Retro gaming and patching is a continues trial of courage, information and testing.
Look at recent games coming out, they need PATCHES just to work out-of-the-box (first released version!).
Thats just how the model works now :(
If you want help, come to discord, and whisper Elerion#6828, i'll see if i can help.
mik: Seems that testing isn't GOG's strength, for me it looks like they did not event start this game 1 time on system with AMD GPU to see if it runs correctly with packaged dx wrapper using default settings.