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.

So they’re plan is to sue the dealership for refusing to sell them a car the cockamamie sovcit way?

How much of Black's Law Dictionary do you think this guy's ever read? Like do you think he keeps it on his desk and refers to it daily or do you think he just read that on Facebook and copy/pasted? Because I'm sure he's definitely a real legal scholar.