Well would you look at that. I was not aware of this, thanks for letting me know!

Well, its not exactly YouTube trying to block adblocker, rather Google in trying to disable the use of adblockers on chromium based browsers, with the reason being YouTube revenue from ads.

However, they announced this in late 2022 and I am not sure weather or not it actually was implemented (Firefox user).

Here is a link to a news article I found talking about this.