Adding on to what other staff members have already said. Admitting to hacks is not a first offense permban. You get banned for 7 days to start off, after that it's a permban. So with that, if you were joking, just know never to do that again. We don't really care if it's a joke, hacking is a serious thing and it ruins gameplay for everyone else.
As for DDoS threats. That is a real crime. It doesn't matter if you are joking, if you live in the US and say that, you are breaking federal law. You're lucky to only be permbanned from a minecraft server rather than be put to trial in court. As for EU, I think it's illegal in the UK but other than that I don't know. DDoS threats for sure deserve a permban.