Huge story. The constitution is upheld. If you want universal mail in ballots you have to legislate. Next: consider a decertification resolution.
That ship has sailed, and the dock is now under water.
Legal procedure to remove illegally-seated officials, or officials caught in criminal acts, is a quo warranto ('by what authority'). Courts are out of it due to the plenary powers granted in the US Constitution between state and federal legislatures to determine election rules and results. A court can rule that election laws were broken or not, and whether a fraud occurred, but final resolution rests with the legislatures. An example is the actions taken after our Civil War in denying states seats in Congress for a time. Today's problems are not from a Confederacy of states, but from a political party that should be de-certified for its bad manners.
This ruling and $10 will buy you a cup of coffee in the Biden age. It does nothing to help.