looks like rendering adblockers extensions obsolete with manifest-v3 was not enough so now they try to implement DRM into the browser giving the ability to any website to refuse traffic to you if you don’t run a complaint browser ( cough…firefox )
here is an article in hacker news since i’m sure they can explain this to you better than i.
and also some github docs
What I mean is, if the attestor checks the integrity of the site, why couldn’t the unmodified site be ran in a container to trick the attestor?
Possibly, but it sounds like a pain to work with, if I understand the technical details correctly.