If you have a model without V2L, why not just go to a dealership that has a GTL2 on the lot and ask to try the V2L adapter in your car?
Honestly, dealers seems to be more clueless about the EV6 features than people owning or buying the car. I've seen so many post where people were given misinformation from dealers. Even ive recieved wrong information from the dealer i got mines from regarding the steering wheel pedals, remote start, and total mileage each trim configuration has.
I'm waiting on the dealership closer to my house to get some EV6 in stock. Went to them for the Roll-away recall and they were much more knowledgeable on my EV6; considering they not even having any for sale yet.