It’s always encouraging when a conservative has clearly never read the Constitution:
Article I, Section 10, Clause 3
No State shall, without the Consent of Congress, ... enter into any Agreement or Compact with another State.
Your point, based on the assertion someone, presumably the author, has never read the constitution, has won a standing ovation from the anti-MAGA's.
Beyond that, from the article: "States have a long history of creating partnerships with each other"; and, I will add "especially the citizens of a state at the political party level".
It doesn’t matter. As far as I know, the reason we have both a Regional Greenhouse Gas Initiative for the northeastern and Mid-Atlantic states and a National Popular Vote compact is because Congress implicitly approved both these questionable initiatives by sitting on its ass.
And also, as far as I know, Congress did nothing to review the compact inked between California (under Schwarzengger) and 1 or 2 Canadian provinces to try to curb global warming.
But watch Congress with this pro-freedom interstate compact. Suddenly, they’ll be all up in our grills, so to speak.