I noticed a former mod who has deleted all their accounts still has their chat account (emphasis mine):
My diamond how now been removed and I have scheduled the deletion of all of my accounts across the network.
Whatever the interpretation for my action, this wasn't done out a sense of pettiness, attention-seeking, or of protesting against Stack Exchange.
This is my protection from the self-harm that seems to be endemic in the community right now. As much as I support Monica and despise the way in which she was deposed, there is seemingly no end to the amount of conflict that this situation and the events around it has plunged the community into.
When looking for dupes, I found that that's a quirk of the system, according to Monica:
The root problem is that when a chat user's parent account gets deleted, the chat account doesn't get reparented. We should fix that, and delete the chat account only when there is no remaining account on that user's network profile that is relevant to the chat server in question.
Now, I'm wondering if it's actually possible to delete a chat account after deleting all accounts on SE sites in the network. After all, you can no longer simply sign in on an SE network account and delete your chat account.
How does that work? Or is this a non-issue because (not saying that it is) there is no personal information associated with the chat account. How does this work?
Sonic commented a link to this answer. That appears to say that the issue in the quote is fixed, that the chat account should be deleted when all users are deleted. That doesn't appear to be the case here, is that a bug?