I assure you that I do not, not have I ever, dismissed leaks out of hand. I used to read Charlie Demerjian back when he was with The Inquirer. I think that perhaps I missed the leak to which you're referring. It's very possible because I've been so pissed off about the lack of availability to the point that nothing seems to actually exist that I haven't been watching as much RedGamingTech as I usually do because what's the point in getting excited about the next upcoming paper launch?
I used to watch AdoredTV religiously before Jim decided not to cover tech anymore (can't say that I blame him) so my attention hasn't been on that side of things over the last month or two. It's hard to no longer hear the "Alright guys, how's it goin'?" with his Scottish brogue after so many years of taking it for granted. He really was the greatest TechTuber that I've ever seen IMO.
But hey, if what you say is true, that's great! We need more than just a duopoly in the GPU space, even if that third wheel is a company that I hate. I'd even welcome S3 and/or Matrox if they were to come up with something (they both still exist). If you could post a link to the leak you're referencing, it would be most appreciated. A performance jump that big in a span of time that short has never happened before (that I've ever seen or heard about and I've been building PCs since 1988) and I would be very interested to read it.
Eh, maybe I'm just becoming cynical about tech advancement in my old age.