Blargerer is probably saying that because the Mastodon post OP linked to says “In 2016 the EU Commission confirmed in writing that adblock detection requires consent.”

That, in turn, is probably referring to a letter received from the European Commission by the same person, which you can see here: twitter.com/alexanderhanff/…/722861362607747072

It’s not exactly a “ruling”, but it’s still pretty convincing.