They key will be WHICH SLATE OF ELECTORS gets selected.
Do the ‘compact’ states put into place the Electors based on the slate based on the National vote?
or do they put into place the Electors for the slate based on the State vote?
To be specific, let us say that the Republican’s (R) win the popular vote in a State. That the Democrats (D) win the national vote.
We have two slates, R and D. Which one goes to the electoral college in that State? The R slate or the D slate?
Each slate will have pledged to vote for their respective candidate (now mandated).
I expect when the crisis comes, both slates will go. both slates will cast their votes. Then Congress will decide which votes to count... and the Supremes will be left to apologize for the decision.
This decision says states can enforce the choice the impanel electors to make, if they want to. That's all. It doesn't say electors have to follow the state's popular vote, it says electors have to follow state law.