I've read the same things you have read and I recently also watched the film. Like I said in an earlier post, Ben Shapiro has criticized the film and I agree with most of his criticisms. He also criticized the "fact checks" and I also agree with most of his criticisms there as well. Of course you're going to agree with the articles you've read, but what you don't know is that those shadows they are casting are flawed in many ways. Mostly because they aren't giving you the full story of what they are criticizing (ie the cell phone data and excluding taxi drivers, etc). They intentionally left out the fact that the scope used to identify "mules" was very narrow and thus most likely quite accurate (although I agree it's potentially not 100%).
I highly recommend you watch the video below because it will show the errors of the film as well as the errors of the "fact" checkers.
Only issue I have with Shapiro here is that, as soon as a ballot (filled out by a legal voter or not) is transported by someone that should not be handing that ballot, it becomes invalid and thus illegal.