It is only about every half a decade that new consoles come out. There would no doubt be lots of tuning involved, getting *something* up and running is the first rule of porting code to a new platform but then you get the incremental task of trying to make it work well rather than limp along with half the features missing. Also you rapidly learn to hide platform dependant code as much as possible. It isn't easy, but making code from platform X run on platform Y is a well trodden path.
So hence claiming it couldn't possibly be done comes across as both arrogant and stupid.