It looks like something broke on their system. When I try to view the community directly on sopuli.xyz, I don't see any posts:
I see comments up to one hour ago.
EDIT: Note that there's also the "War in Ukraine" community at !war@group.lt, but that gets far less traffic.
EDIT2: I don't see obvious modlog activity removing posts.
EDIT3: Hmm. It's specific to that community. !steamdeck@sopuli.xyz is functional: https://sopuli.xyz/c/steamdeck
EDIT4: The list of mods on that community has not changed since this archive.org snapshot of the page on October 7, so I don't think that it's a case of someone getting mod authority and wiping everything and me just not understanding how to see it in the modlog. Or at least if so, that account is no longer listed as a mod.
EDIT5: Also posted on that instance's !main@sopuli.xyz community, which looks like it's the one for instance discussion; hopefully that may catch someone's eye.