It's disingenuous to pretend the current US admin prioritizes state rights or separation of powers. They have very explicitly pushed an ideology of unitary power and maximizing their control of federal agencies over congress and state powers.
The Republicans don't just control the executive, they also control both chambers of Congress (and, lets be real, the Supreme Court as well).
The fact that they don't act like it and just allow the executive to do whatever it wants doesn't absolve them of responsibility for what the executive does.
That's exactly the point, yes - the Republicans have always claimed to be the party of Small Government and of States Rights while in the opposition, but in reality when they are in power they immediately act to expand federal powers, both over the states that they don't like and overall in the economy and day to day life.