A few months ago ublock origin wasn't working for a subset of users (that youtube was using to test features that would break ublock origin for everyone). Ublock had to do make changes to counter youtubes efforts. They did so successfully and became an even more robust ad blocker than before. If they had not, we all would have been seeing ads break through months back.

My point is that it is an arms race and so far ublock (and other ad blockers, though ublock consistently proves the best) has been able to keep ahead for the most part. I don't know for sure if this is the moment when youtube starts to pull in front, obviously I hope not. But even if they do, that doesn't mean ublock will be permanently broken. Even if ads got through for you today, it doesn't necessarily mean they will tomorrow. We'll see.