I do not believe it.
This implies That the Dread Traitor Roberts in onboard.
Mr. Its a fee not a tax onboard with this? Mr. Trump has no standing because we don’t want riots?
It's likely just a draft decision that has been illegally leaked to intentionally sabotage the process.
But Roberts could himself dissent and it still be a 5-4 decision. (Thomas, Alito, Barrett, Kavanaugh, Gorsuch are 5 Justices)