As far as I’m aware no one did the simplest possible check:
1) Take a 1000 random mail-in ballots
2) Ask the supposed voters if they cast those ballots
Find even a couple that didn’t vote and you can prove phony votes were added to the ballot stream.
Unfortunately they succeeded in having us focus almost entirely on the machines instead of the paper.
The machines are NOT the issue as you state, it’s people and the laws that allow things like universal mail in voting, ballot harvesting, etc. that are the issue.
Mike Lindell has so many crazy ideas that I sometimes wonder if he’s plant that is designed to make everyone who supports Trump look like a complete lunatic.