My bet is that some sort of auto ban logic kicked in, maybe due to abuse of reporting features. It'd if course be worse if a human moderator took it down or affirmed such a decision but not impossible.

Meta and other big tech usually over-relies on automated enforcement because it's easier on their wallets than hiring enough moderators to keep up in near-real time. And it's hella easy for a group of motivated people to coordinate flagging of content, which the automation often takes at face value.

Clearly having public spaces in private hands like this is tricky, as if we try to require better moderation that ends up to expensive, private interests will probably find a way to just kick anything controversial / political off their platforms.