I saw that today as well on my Mac.
I went to the settings for Adguard AdBlocker 2.6.12, and checked the box for “Use an old API instead of the “Content Blocking API” and restarted Safari.
Problem is gone.
I got the alert, complied, went to the article, which didn’t demand I turn off ABP, went back to Drudge. ABP was on again, stayed on and I finished my afternoon scan of Drudge.