This was also a stock automatic and I don't recall a mention of what gears were in the car.
I can't see the vid so I will take your word for it.
I would assume since that car was Brembo'd it would have to be 3.55 or 3.73.
If the above is true, then the only gear option it has is 3.15.
They test in Owings Mills, MD. I think their numbers are more real world, as compared to someone who's out to bang gears and burn rubber. Having said that, I think they're a bunch of old farts.
I bet they use Capitol Raceway, which is not top-tier in terms of track prep.