Yup it appears that our entire comment chain got nuked. So it is now confirmed that if you delete the parent, then all children get removed as well.
For any reading this message, the context is that we tested it by me replying to OP's previous comment, then OP responding to me, then I deleted my comment to see if their comment also got deleted.
Does your network not support UPnP? You shouldn't normally need to port forward in order to seed a torrent, unless your network prevents NAT traversal.