I think they claimed that is was a GM motor and they got away with it I think. The dirty tricks they have played during the years and the doors are still open.
Like the intake issue with the 3.1. GM completely exhausted their own supply of intake gaskets and exhausted all the jobbers as well and yet they still claimed there wasn't a problem with them. GM paid big time for that one in a multi class action lawsuit started at Nichols Motors (GM dealer) just 15 minutes down the road. They paid out 1.5 billion. Of course that is chicken scratch to them but at least the people got reimbursed for the repairs done.
I assume you know the Buick Envision and similar models are all built in China. Every single solitary piece is made in China. Wonder how long they will last? Not long I'm guessing