I tested ublock and one named PIE, in both of my Chromebooks and they both worked fine in here.
I have them now turned off and still installed.

Right now I have AdGuard and Privacy Beaver both turned on and so far I have seen nothing in here telling me to delete them.

I first saw a news story about Google killing ad Blockers. And I checked the Web Store and many of them were saying to remove all of those ad Blockers.