"It's really unclear what we would even do with it, let alone how upset people would get with whatever we did," says the co-founder of Rockstar Games. "Both intense liberal progression and intense conservatism are both very militant, and very angry.
It is scary but it's also strange, and yet both of them seem occasionally to veer towards the absurd. It's hard to satirise for those reasons. Some of the stuff you see is straightforwardly beyond satire. It would be out of date within two minutes, everything is changing so fast."
So if, they're not releasing it in the age of Trump, that means that GTA6 is a no-no before 2020, at least, as they presumably believe that he won't be in office after his first term.
If that's the case, could it that mean they haven't even started writing it (or parts of it) yet? Doesn't make much sense as, i'd say that was a bit of a vague response from him.
Via GQ: (Full RDR2 interview)