That may be what is being discussed here, but the case has little to do with the voting state compact. Although it would have ramifications for it.

The question in the case is whether the 10th amendment allows for states to make electors bound to their state’s vote, or if the electors are “free” to vote for anyone regardless of who the people voted for when the 12th amendment outline the process.

I believe that the 10th amendment argument should win the day, but who knows. If they rule for the 12th amendment, it will certainly open Pandora’s box, and who knows where we will end up.