This were at least 5 accounts with posts seconds apart. It was a hack.
Depends on your definition of “hack” I guess...someone collecting hundreds of Freeper usernames over time and throwing a password cracker at them to get their password then logging in all the accounts they compromised to post rapid-fire (run a script) spam posts is not a “hack of the website” in my book. It a compromise of a weak password. Use more than 11 random digits (no words/names) and include “special characters”.
https://www.grc.com/haystack.htm