Given that the Fediverse is wide open, unencrypted, and your instance owner is no more immune to getting a subpoena from law enforcement than anyone else … one might think twice about asking questions of the form “if I commit a crime can they find me” here. Even if your VPS can’t detect it, you just left a paper trail here by asking how to commit a crime. :) Bad plan.
Your Fediverse instance owner might consider deleting your post and perhaps your account to keep them from being the subject of such a subpoena in the future.
Not just your instance. Every instance Federated with it that got a copy of your post is part of the chain of evidence. Don’t plan crimes in the fediverse for heaven sakes.