Maybe MS have realised they’ll gain more by not being dicks about it? It’s not as if Skyrim is going to help them sell any more consoles, not after all these years. Ultimate Skyrim requires Skyrim Classic Edition with all DLC’s, otherwise known as Skyrim Legendary Edition. If you’re unsure about any part of the guide, feel free to ask the Community for support. Or the PS5 gets left with an enhanced version still running in BC mode and the X|S get an actual new version. Welcome to Ultimate Skyrim, and thank you for your interest in the project This page will guide you through the install process. That could be a native next-gen version, or could just be the existing version “enhanced” in some way. There’s also “a free upgrade to an enhanced version on November 11 for their respective PlayStation 5 and Xbox Series X | S systems”. It’s the base game with some extra DLC included.
Or buy the anniversary edition with it included, I guess. The anniversary edition includes the 500 extra things, but you have to pay to upgrade to that version. The special edition gets 3 bits of new stuff, including fishing (because everyone loves fishing, apparently).