Rockstar doesn't necessarily have to do the port themselves. Shiver brought MK11/MK1 and Hogwarts Legacy to Switch 1 and has brought WWE to Switch 2 and a job listing from one of their employees says they are working on a AAA game port for Switch 2 which required an engine that isn't on Switch 1/2 to be ported from the ground level up.
I actually wondered why Nintendo themselves bought Shiver Entertainment 100% outright. They were functioning just fine with 3rd parties as is, I think they had a big ticket port or two in mind and purchased them more specifically for that, this would certainly fit that bill.
Not saying that's a lock at all, but that could be a possibility.







