Nah I’m pretty sure it’s still lemmy. This page seems to say they are looking at moving to something else, but they’re still using lemmy for now https://docs.beehaw.org/docs/important-questions-decisions-and-reflections/beehaw-lemmy-and-a-vision-of-the-fediverse/

Ooh syncs saved posts as well! Definitely downloading this

Edit: Ah that’s not ready yet. Still very cool