it does. (I switched from Adblock because I was having the same issues, and they didn't seem to be getting on top of them!) I very occasionally get a blank white screen with the skip ad button to proceed, but it doesn't actually serve the ad, which is my main bugbear
That's what I was getting (blank screen but ad not actually being served) using AdBlockPlus, until recently that is.
Out of curiosity, are you on the latest 14.1 Safari on Catalina as well?
Thanks for the heads up, it doesn't work for me though in terms of removing the YouTube ads unfortunately (does it work for you?)