These were alternative electors - perfectly legal.
I am not entirely familiar with the process or this states case but if they forged documents in pursuit of their legal right to alternative electors... they could be guilty.
If I had to guess though its just more mud slinging with no actual crime of any sort.
Re: 2 - they signed legal documents that they were “duly elected and qualified electors”. That’s significantly different from “alternative electors”.
Perfectly legal indeed. I WAS an alternate elector in Maryland.
I'm old enough to remember when the Michigan Mean Girls waited till it was too late for former Michigan governor Rick Snyder to join the fight opposing the 2020 MI electoral - then indicted him for felonies over Flint a week later...