The two UCC references they list:
https://www.law.cornell.edu/ucc/1/1-201#1-201b37
“Signed” includes using any symbol executed or adopted with present intention to adopt or accept a writing.
https://www.law.cornell.edu/ucc/1/1-304
§ 1-304. Obligation of Good Faith.
Every contract or duty within the Uniform Commercial Code imposes an obligation of good faith in its performance and enforcement.
From what I can understand of this mess, they’re trying to buy a car, or otherwise enter a contract of some sort with Volkswagen. I’m no lawyer, but I’m pretty sure sections like § 1-304
only mean after you enter a contract, you’re obligated to uphold it. If someone doesn’t want to enter into a contract with you because they don’t like the way you write your signature, it’s their right to tell you to get bent.
What do they think “running the passport number” will do? I’ve seen that in several of these posts. I can’t imagine whoever they got their paper from will have been able to create a number that exists in any system that a cop uses during a traffic stop.