What is the update delay for Fediseer?

I don't know. It's not something I'm familiar with - it might just default to saying 'closed' if it doesn't have the data.

It's interesting that the obvious bot accounts on those instances were set up in mid-March last year, so I'm guessing that these are somebody's army that they've used before, but overplayed their hand when they turned it on the DonaldJMusk person. The admins can reasonably be blamed for setting up instances with open registrations and no protections and then forgetting about them, but I'd be wary of blaming them for being behind the attack directly. The 'nicole' person is unlikely to have used their own instance - it's probably just someone with the same MO as whoever owns the bots, finding and exploiting vulnerable instances.