"All" tab only ingests posts from Communities with subscriber from monyet.cc. Might be worthwhile for you browse around https://lemmyverse.net/communities and start subbing.

Another option is for the admin here run a communities crawler and sub to active communities.

Wouldn't be too fussed about it tbh, can never play it too safe when it comes to such incidents.

edit-mmm still can't see the posts here from my instance, sadge

No wonder I couldn't see the posts from here today from my instance. Anyway RC2 is out, which should fix this XSS vulnerability