I'm mostly a lurker on TVA but every since the sharty stuff started I've been checking the site every now and then, I can confirm that this was the "them" though, put in quotes because I'm 95% sure it was a single person just by the way the replies to the thread look:
https://web.archive.org/web/20240903082923/https://soyak.party/soy/thread/8467360.html
Looking at the main thread on their /raid/ board, it seems the guy got pissed/desperate because someone called him out on their recent raids being failures plus the overall apathy the site has towards Pippa now and decided to go one-man army. He seems to be a major autist judging by the sheer amount of responses he has on the main thread so, I don't think he will stop anytime soon (The thread has 565 replies, and 249 of them are from him).