You are entitled to your
You are entitled to your opinion, however uninformed.
GM has had an integrated global product development organization for many years. Your notions of the roles of the nameplates you cite betrays your ignorance of that fact. Rest assured, GM is not concerned about technology developed in Sweden.
GM's opposition to fuel economy standards was shared by all of the American makers and most others, as they understand it forced product changes at odds with what American customers want, and uniquely burdened and financially harmed the domestics in particular. What I wrote about the ZEV mandate is precisely accurate.