RE: Audio CHIP ALC3266 support on Linux - Dell XPS 15 9550 - Disaster
Yes, you are right, wrong URL, it is easy to find on Youtube that there were actually XPS (older revisions) which were having audio board separately connected via USB.
But you are right, the link I shared is not related to board. Sorry and thanks for your answers.
Actual XPS doesn't support replacement and that is end of story then.
Here is correct link about history of XPS audio board: