QAnon Is Celebrating the Return of Its Leader After 18 Months of SilenceExperts say the new “Q drops” look fake, but that’s not stopping devoted QAnon believers from celebrating Q’s return.
tl;dr this time Jim Watkins fucked up and left conclusive evidence that whoever was posting as "Q" wasn't the original Q but either Watkins himself or someone else with the keys to the site. This doesn't conclusively prove that any of the other Q posts were actually him, but it conclusively proves that they
could have been, and people who have been watching Qanon unfold have long suspected Watkins was posting as Q.
A bit more on the technical details of how channers figured it out:
Basically the downside to impersonating someone whose fans are obsessed with searching for numerical patterns is that in amongst all the apophenia, if there are some real, intentional patterns in there, someone's probably going to find them.