You'd be dreaming if you literally think game performance will increase threefold. Even if something like this rumor makes it to a PR slide, Nvidia is no newcomer to that sort of hyperbolic claim:
But it's obvious at the same time Nvidia will have, at the very least, 50% better performance per watt than AMD has achieved on the new node with RDNA, since they just about merely matched Turing with the shrink to 7 nm. You certainly won't need a 250W GPU to more than overperform the next generation consoles.
Intel, AMD, Nvidia, MS, Sony, the list is endless, they all bullshit. But it will be nice to see at least some improvements over turing, those cards are underwhelming.