There was a lawsuit, it was dismissed. States Partys of incumbent Presidents with no serious challenges have done this before. It is nothing new. Going to court to sue to force them to waste time and money on it is the new thing.
Agreed. And another way to look at it is that a court has just ruled that since SC’s Republican Party can control whether or not it has a primary, so can the DNC as whole not be liable for rigging their national primary in 2016. So it could be seen as a protection mechanism for the Dims who got caught trying to cheat in 2016 (i.e. Hillary and her cronies).