2016 Wrangler JKU, towed over 20,000 miles and never heard of that one. Never had any problems, except once, the vehicle to vehicle charging wiring fuse failed, probably when running both engines at the same time with the unbilical connected. 10 cent part.
Think maybe someone's pulling their legs to make a few extra bucks? More likely, they've left the key in the ignition in the "on" position, which isn't necessary in ours, as the steering doesn't lock. Or the battery wasn't being charged from the tow vehicle, and the dead Jeep battery caused problems down stream.