In addition to that, Ernest stated that "there is no connection between reputation points and sorting algorithms. It's just info in the profile" (link)
Unless Ernest changed this too and I missed it, boosts still work with the microblogging portion of the fediverse, such as Mastodon. Upvotes and downvotes only interact with the “threadiverse”.
So my understanding is that boosts are now reflecting on threads as 2 upvotes, whereas on microblog posts they reflect as boosts and as 2 upvotes but only on the threadiverse sites.