In my opinion it’s unreasonable to think anything can truly be deleted in a federated system. Even if the official codebase is updated to do complete deletion & overwrite, it’s impossible to prevent some bad actor from federating in a fork that just ignores deletion requests.
Seems sensible to just not post anything that you don’t want to be available for the lifetime of the internet.
Their web site is down, but their Github account is currently still available, with 3D printing files and software for their microlab.