I agree with Thomas and Alito. It was a wrong decision.
And I would add that all voters and states are connected to and harmed from the unconstitutional actions of these governors and SoS's.
That's called standing.
Please note that Thomas believed they can’t refuse to accept the filing BUT he said he would grant no further relief.
That pretty much settles it.
Trump was right about the mail voting but no one stopped it before it happened.