I do try to leave dealing with reports to community mods most of the time. Since the post was on lemmy.world - and they're quite good with moderation - I've not actioned it. Having said that, since it's obviously been left untouched (or federation is simply broken on their end, again), I have now removed it locally.
On top of that, what @[email protected] said is a very gentle expression of current state of affairs. Lemmy, as software, is actually ridiculously bad. Chats on matrix are constantly full of the most random issues. I have had to pretty much double provision the whole thing just to account for the internal crashes and make them less visible to the people using this instance.