The theory is based on the reading that Article I implies that only state legislatures may make any decisions related to election law, and prevent any actions from courts or the executive branch from challenging it.

Hmm; this case merits more research. Just from your synopsis, I'm not sure North Carolina winning would be a good thing because then both sides would just gerrymander the states they currently control to ensure the other party never has a chance again.

That sounds great for red states, but blue states already have an outsized impact on federal representation because of their population centers, and those are only going to grow as they welcome in hordes of illegals and their offspring. Another couple censuses and the Senate could get stacked with libs.