This is even bigger than an attempt to reverse Sullivan: they're also asking the Supremes to apply the Seventh Amendment right to a jury trial in civil cases to state courts. Without getting into a big Con Law thing, that's one of the very few Bill of Rights rights that has not been "incorporated," i.e. held to apply to states by virtue of the Fourteenth Amendment. That's super geeky and technical, but IMHO if the court were to do that it would be an even bigger deal than reversing Sullivan.
Full petition is linked below, if anyone's interested. It's not completely nuts; Mr. Wynn seems to have decent lawyers. The central issue is whether it's reasonable to require a plaintiff to prove actual malice at the anti-SLAPP stage of litigation, which happens very early in the process before much, or any, discovery has been conducted. It only takes four votes to grant review. Thomas and Alito for sure, and this might be interesting enough to get Gorsuch and Kavanaugh on board.
https://www.dropbox.com/scl/fi/ji0h6ww48w1yj7ingk39t/Wynn-cert-petn.pdf?rlkey=forziz9zp2myuin3t2l69ikg0&dl=0