I think you are mis-reading this.
The author is not advocating for federalization of elections the way I read it.
The way I read it is the author is making the very valid point that people from these states have legal battles regarding election law and the content of the cases bears on the constitutionality of the components of those battles, and he asserts (rightly, IMO) that the Supreme Court abdicated their responsibility by NOT getting involved.
I don’t think I misread it at all. Constitutional matters are one thing, but allowing one state to use the Federal courts to enforce another state’s laws has no basis in U.S. constitutional law. It basically abrogates the sovereignty of state governments.