Whether there is a hidden agenda or not, the authors of the spec can just reply, "that isn't the agenda" and ignore everything in your comment that followed from it.
What I do see a lot: * This will be used to detect and block ad blockers. * Open source users can't do attestation and will get locked out of parts of the web.
These are not goals of this proposal from what I can tell. And there are indeed discussions how to avoid those negative externalities.
That's as clear as day, they won't let you view the page with ad blocking.