At that time I was reading up on the post/comments here but now I don't remember if there was any consensus as to the legitimacy of those posts. And maybe it's not possible to determine 100% whether it was or wasn't the Q team who posted.
The posts started on Jun 24, the date Roe v. Wade was overturned. And I guess at that time someone noticed 11.3 in some Roe v. Wade legal documents. So if 11.3 is a reference to Roe v. Wade then most likely no one would have associated 11.3 with Roe v. Wade without those Q posts showing up.
Yeah, certainly possible. But just the fact of the post happening on the same day as Roe v Wade is what caused people to see the 11.3 in the Roe v Wade legal documents. Now maybe someone was reading over the Roe v Wade legal documents and noticed 11.3 and figured they would play a joke on the Q community and post as Q. But it certainly seems that no association between 11.3 and Roe v Wade would have been made without those Q posts.