Could be. I was not too worried about the deleted post for that reason. My posts that were censored were in a thread started by Peter Todd, I though he may have tampered with them , until I saw 2 of his posts also were censored in the same way. Unless he censored himself. Weird. Bottom line. We need a tamper proof network , otherwise what's the point ? Bitorrent with over 10m nodes probably gives you at least a few tens of thousands of nodes for your posts , out the gate.
Discussion
Nostr seems to be pretty tamper proof. Popular clients do allow users to report abuse though. For example, you can report a post as spam. It's up to relays and clients to accept or reject the report, and decide what to do with that information though. Maybe that's what happened with some of your posts.