In the email you have linked to, he does not support tivoization. He simply says that he finds the term offensive (which is really funny coming from him).
Torvalds has also publicly stated that he doesn't think that tivoization benefits users, but it's not his battle to fight. More info on that topic can be found in the linked YT (linked at the precise time he is answering the question about tivoization, but the whole video is about GPL v2 vs GPL v3).
The cause is probably related to the new OS, but I don't have that same wait on my multiple Tahoe systems, so it's not just because: Tahoe.
If you're a Linux user, or were a Linux user, check the logs, close programs, uncheck login items 1 by 1, run "launchctl list", etc to identify the specific cause.
I didn't see a single comment of "I will fork it" type.