Of course they won't reverse the election. That's not what they do.
But this a constitutional case where they could rule that the existing certified electors are tainted because they were selected by a process that violated the state's election laws and, in turn, the US Constitution.
That would require each state's legislature to select a new slate of electors, different from the ones certified from the tainted elections. Or not.
There are 62 electoral votes between the four defendant states. If all four states selected new electors, that would be enough to put either Trump or Biden over the 270 finish line. If the legislatures came up with none or only part of the total electors, then there may or may not be enough votes to to give one of the candidates 270, depending on the number of electors they picked.
If there weren't enough electors selected to give either of the candidates the win or there was a tie at 270 each, then the whole mess would go to the state delegations in the House to finally decide the race. Each state delegation in the House gets one vote and currently, the Republicans, and therefore by extension, have the majority of the delegations Trump would win.
So, yes, I agree, the USSC won't reverse the election. But their ruling and the resulting machinations of the state legislatures and/or the House, could very well reverse the election. We'll have to wait and see what happens.
“But their ruling and the resulting machinations of the state legislatures and/or the House, could very well reverse the election.”
Not a chance. Sad, but true.