Let me educate you.
GM is designing each of the platform replacements to be RHD so selling cars anywhere will it be as difficult.
The Alpha2, Vette and even trucks will be designed to be RHD. The Blazer, Acadia and Cadillacs are RHD capable.
The Nox is already RHD.
Opel is not a factor.
Trucks and CUV/SUV models will only matter there just as here.