Pontiac, as a brand, shut down in 2009-2010.

So using an old photo of a failed Pontiac dealer as being an example of current labor issues is being more than a little disingenuous.

Bonus:

https://www.bridgemi.com/michigan-government/kevin-rinke-channels-trumps-business-outsider-label-mi-governors-race

GM killed:

Oldsmobile - 2004
Pontiac - 2009/2010
Saab - 2009/2010
Saturn - 2009/2010
Opel - 2010

The surviving brands are:

Buick (apparently Buick is HUGE in China, they are to China what Cadillac is here.)
Cadillac
Chevrolet (including Corvette)
GMC (including Hummer)

They are also partners in two Chinese brands, Baojun, and Wuling.