You’re still missing the point and your interpretation is not 100%.
Marbury is used as precedent by courts to prohibit the Executive branch from enforcing an unconstitutional law or prohibit the Legislative branch from carrying on an unconstitutional process.
The question Brunson is attempting to get before the Court is:
“Can Congress certify Electors if they have violated their Oaths of Office in doing so?”
Here’s another version:
“Can Congress certify a candidate for President without first investigating significant fraud behind the election of that candidate?
Here’s some detail worth knowing:
* A new or reelected President must be inaugurated on January 20; it’s in the Constitution.
* Certification of Electors by the date January 6 is NOT in the Constitution.
* If Electors are not certified by or before January 20, the 12th Amendment governs.
It just so happens that if the 12th Amendment had been necessary, President Trump would have won, because each House delegation gets one and only one vote.
Good luck! You’re going to need it....