Saw this article yesterday, and was apoplectic. To expand on your post, vote registration canvassers are legally required to turn in all registrations/signatures, even if it is signed as "Mickey Mouse", which does happen. So, TN in its infinite wisdom, is legally requiring all registrations to be turned in, and at the same time fining or jailing canvassers who have fake registrations through no fault of their own. It is a perfect Catch-22.
One could even argue that Repubs in heavy Dem areas (and vice versa) could sign Mickey Mouse registrations to screw the canvasers and invalidate the entire registration lists.
Meanwhile. Jim Jordan and Mark Meadows think this is A-OK.