That is not a confirmation, because:
a. Shmee himself is the source of that quote.
b. The quote is rather vague.
Had he said: "I talked to some guys from Sony and they said that the Bugatti will be available in GT7" it would have been another matter, because then it would come from an official source (depending on who he talked to of course, not all Sony reps knows everything about all their games). Even better would be if he could quote someone from PD.
But as it stands now, the quote comes directly from Shmee himself and as such it can't be taken as a confirmation of any kind.
Also, the quote is vague: A "future version of Gran Turismo" could mean an update, it could mean a new game, it could mean that Shmee himself is not sure.
He also says that it's called the Vision Gran Turismo "because it will be featured in upcoming Gran Turismo games". We know that it isn't true: They're called Vision Gran Turismo because they are part of the Vision Gran Turismo program. Why he say "upcoming games" could be because of a misunderstanding, or his own interpretation of what he has been told. It could also be that whoever told him about it had got it wrong as well. If he doesn't know the Gran Turismo series very well it could be easy for him to jump to the conclusion that it is for an upcoming game rather than an update for a current game.