By checking for fealty to the false “stolen” narrative at the outset, Trump’s allies aren’t simply weeding out people who disagree, they’re weeding out people who won’t acquiesce to the Trumpian approach to reality. They’re not just getting rid of people who won’t go along on this one subject; they’re getting rid of people who won’t go along in general.
They may not fail on their own; polling shows Trump as having a decent chance of winning in the general election this fall. It takes actively working to stop the Republicans from holding power. That means checking to make sure your voter registration hasn’t been purged, volunteering, andif you can afford it, providing financial support to the Biden campaign and Democrats in close house and close senate campaigns.