Wouldn’t be that simple. The Stormy Daniels case was about things that happened before he became president. Sure reimbursing Cohen might have occurred at least in part while Trump was president, but Cohen was never part of the administration. They were disguising the reimbursement as paying Cohen in his capacity as Trump’s personal lawyer. So there’s pretty much nothing that this ruling does to hamper this case.
That said, I have no doubts that they’d find some way to rule in his favor if an appeal managed to land in front of them. But I think he’d have to go through normal appeals first, he can’t just go straight to SCOTUS.