Yes, I see it.
It's the same problem that exists today with any self hosted blog, of course. Platforms storically solved it disabling or limiting the edit on a short period.

Maybe the solution is to include the revisions and make them accessible at comments' level. So if something happens the user can always reply to himself and point out that the comment was related to a different context, highlighting the shady update.
A real win would be to somehow force every update/event to include *all* the previous revisions, in this way we can also solve the "vanished from relay" problem, but currently we have only the `d` tag, so revisions are not chainable.