[snassar]

Where do you have this information from? The State of Berlin says otherwise https://service.berlin.de/dienstleistung/121864/en/ :

------ Sufficient knowledge of German You must have an adequate command of the German language (level B 1 of the Common European Framework of Reference for Languages).

If you were in possession of either a residence permit or a residence authorisation on 31/12/2004, you only have to demonstrate basic knowledge of the German language (level A 1) to be granted a permanent settlement permit. ------

In practice the staff giving interviewing you have leeway to assess your German level on the spot, but applying without demonstrated adequate German levels could lead to wasting ones time.

[AdamN]

That's for non-EU citizens. There are 360MM non-German EU citizens - some of which are living in Berlin visa-free.

[bolanyo]

There has never been any language requirement for EU citizens to live in Germany or anywhere else, ever since freedom of movement was established.

[netsharc]

Some? Wouldn't they all be visa free?

Yeah, that page is for non-EU-ians, because if you're from the EU, due to freedom of movement, you can live and work in any other EU country, and you don't even need to apply for a "permanent resident permit".

[PeterisP]

Well, most of these 360MM non-German EU citizens don't live in Berlin or Germany at all, only some of them do.