Note by @franticbiscuit

@tokyo_0 That's because it's not a problem to be solved.

The source server is the only server with the key pairs needed to start an automated deletion. Without those keys, the only way to remove content is if the admin of the other server removes it for you manually.

tl;dr your issue is that your source server had data loss. You can't fix this magically, unfortunately. And with how the fediverse operates, you can't "fix" it at all.

Hope that helps explain things! These are all questions for your server owner.