Of course they did...how else do you think it got there?
A necessary part of the scam was control of the Q-anon animation.
4-chan didn't provide a unique way to identify Q posts, so it was moved to 8-chan.
As for 8-chan security well...the Q-anon hack over the summer speaks for itself.
You are begging the question. This is what is called a Circular argument. . . a fallacy. You claim that QAnon was hacked after being moved to 8chan by YouTube hackers, another one of your falsehoods to prove your claims of the ease of hacking the 8chan security. Absurd.
You are also using evidence from a debunked claimant to being part of Q which has been completely shot down when he FIRST appeared with his assertions. His "facts" were and are FALSE and provably so then and now.
"Microchip," Posobiec's interviewee, is an on-line Q debunking, Twitter user who claims to be the Real Q. His attempts to prove he is Q are quite laughable as he show a depth of ignorance about Q (such as claiming that Q has been monetized and was originally intended for that purpose) that is abysmal, which alone would disqualify him from being Q. His examples from past Q Drops have always been shown to be something he could manipulate on line in archives and they don't comport with archives of Q drops kept by others significantly differing from what he posts as being originals, from what the archives show to be truly original. His claims of programing expertise, when shot down by others is always met by Microchip as claiming that he knows more about it than they do, even on simple programming basics he got completely, often laughably, wrong, which he then tries to claim is due to him being on a different platform than they are.
When called on that claim by people who work on his claimed platform, he doubled down by claiming his version was a custom formatted platform that only HE worked on so naturally it was using a different custom version of the programming language. He claims he does Q on entirely on an iOS device. If that were true, the links to YouTube Q posts would be to mobile sites, they aren’t, the URL’s are to desktop sites. It also would have NOT been able to include the extraneous spaces Q is so find of including in his drops. That is difficult to do on an iOS device which automatically eliminates more than two spaces. There were so many RED FLAGS in his claims he was laughed at. He claimed that Q would no longer be posting due to his exposé and that since he was Q, he would no longer post any more as proof of his assertion, but the very next day Q was posting again. . . contrary to this bozo Microchip's fraudulent claims.
We are far more familiar with these false assertions than are you.