That's right, as the article says
And from the perspective of the "free fediverse" that's not welcoming Meta, the new positioning that ActivityPub integration is "a long way out" is encouraging. OK, it's not as good as "when hell freezes over," but it's a heckuva lot better than "soon."
That's incorrect. Followers-only posts (and local-only posts on instances that have them) aren't public. Profiles that don't make public and unlisted posts aren't discoverable. And, as Threat modeling Meta, the fediverse, and privacy discusses, there are plenty of things that could be done to reduce the amount of data that's public.
Also, that's only one of the many reasons people oppose federating with Meta.