That's the correct form of the "brawl on the 6th" scenario. It requires state legislatures to submit their own slate of electors so that there are two options.

A bunch of them seem to still be struggling to read this you-ess cone-stay-two-shone thing that kids are on about these days (it's the first they've heard of it, you see). But they've got until the 5th to get someone to explain it to them in small words.

The only situation where there would be a single slate that gets decertified is if the ODNI report is such a blockbuster that the nation as a whole is ready to revolt otherwise, and that would require pretty miraculous levels of evidence. And at that point the state legislatures would surely have acted.

This theory is a bit "Bernie can still win", except for the fact that everyone on both sides is sure as hell acting like this isn't over. And since it's not over, the question remains why Trump thinks he can win and everyone is acting like he's right. The 6th is the most obvious mechanism remaining for this to happen.