[DoodleDawg]

And as a final backstop on Jan 6 when the electors are presented to a joint session, Pence or any congressman plus senator can cite this SCOTUS ruling and deny the slate.

No, they can contest the slate so long as one senator and one congressman combine to contest. It then goes to the House and the Senate where a majority must agree to deny the states electors. With the Democrats holding the House what is the chance of that?

[dontreadthis]

while I agree that the procedure you describe is part of the process, it’s a 100x more involved than that.
The article below by a Conn Law Prof is mind-blowing as to what maneuvers can occur. He wrote it before the Dem primaries, and he expected Warren to be the nominee. He games it out to the nTH degree, just substitute Biden for Warren.
On page 326 begins the period from Jan. 6 to Jan. 20

https://lawecommons.luc.edu/cgi/viewcontent.cgi?article=2719&context=luclj

[conservatism_IS_compassion]

they can contest the slate so long as one senator and one congressman combine to contest. It then goes to the House and the Senate where a majority must agree to deny the states electors. With the Democrats holding the House what is the chance of that?

What this will mean we don't know yet, but I expect those electors not able to be certified. And what this means for the down ballot in PA I can't begin to imagine