No obvious need to reinstall if you didn't use ssh and expose it publicly and are not a politically important person. All signs suggest that it was a nation state attack, and you are likely not a target.
We'll see... given that sshd is just one of many possible argv[0] it may have choosen to act on, I'm going to be a little paranoid until it's been fully analyzed. It just takes half an hour to reinstall, I have some shows to catch up on anyway :)
