@Tom E.
AnyDVD's Cinavia removal is one of two things, and works as well on UHD discs as it does for Blu-rays, according to the RedFox developers (I think that answers one of your questions):
1. blocking detection in playback software, such as PowerDVD, that is running on the same computer as AnyDVD. So this only works during real-time playback of the disc/ISO image, and cannot be captured and stored for playback on another device or computer;
2. removing Cinavia from the audio tracks, working in conjunction ONLY with CloneBD, to produce an ISO or media file that has lossy audio (no TrueHD, no DTS-HD, no DTS-X). The resulting modified audio has a "warble" that can either be ignored or not, depending on how picky you are about audio fidelity.
Best to play back your resulting UHD disc backup with a system that doesn't have Cinavia detection in it at all or is disabled during playback -- you get the best audio fidelity that way.
--michael
I don't have any familiarity with DeUHD so I can't comment on what it supports, and I haven't looked at makemkv for a few months. However, elsewhere on this forum in the UHD discussions there is mention made that certain AnyDVD users found that their UHD discs were supported on AnyDVD but not in DeUHD or makemkv. As for a repository of which discs are supported and which not, that's not been done for AnyDVD so there's no way to compare. That's why I didn't attempt to answer your first question.
As for Cinavia removal, the second method I mentioned (working with CloneBD) can produce an ISO -- which can then be burned onto a disk for playback on a standalone player.
There exists absolutely NO Cinavia removal tools that produce a result with "clean" audio that can be played on a Cinavia-restricted player (hardware or software player). To remove the Cinavia audio watermark means that the audio has to be significantly modified to change certain frequency ranges, and that will produce quite definitely audible distortion, or even shifting pitches of music and dialogue. It's unavoidable due to the method used to embed the Cinavia audio watermark.
If there's a recent (past couple of months) new method to remove Cinavia that creates perfect audio, I haven't heard of it, so I would be happy to know about it. But as of the end of last year, no such thing existed.
--michael
Whatever you do, you will certainly loose 3D audio (Dolby Atmos, DTS:X). Better to use a player, which doesn't care about Cinavia, or where AnyDVD's unique Cinivia removal works. A PC, a media player like Nvidia Shield TV, OSMC Vero 4K or a cheap X96 with LibreElec.I have dvdfab, but haven't used it for a long time. They state its lossless audio?
https://www.dvdfab.cn/blu-ray-cinavia-removal.htm
Whatever you do, you will certainly loose 3D audio (Dolby Atmos, DTS:X). Better to use a player, which doesn't care about Cinavia, or where AnyDVD's unique Cinivia removal works. A PC, a media player like Nvidia Shield TV, OSMC Vero 4K or a cheap X96 with LibreElec.