Please don't be so vague, there are people here who don't have your knowledge. I know you get a lot of backslash from some guys, when you speculate/predict this kind of stuff, but really, that's what this thread is about, and is desperately needing! _ ffs it has turned into a Corona virus/first-party PC ports, discussion...
I think you might be talking about Cerny statements in a interview, back in 2016 after PS4 Pro launch, and that was for current gen games at native 4k not 60 FPS _ at least 8tf with the GCN GPUs of course.
Yeah, i'm with you, i would like to know to what people with more insight think of _ with what we know about the CPU, RAM, etc what's the minimum for a native 4k 60 FPS on next gen games.
Unfortunately the best we have wright now, on AMDs RDNA new gen for comparison, is the NAVI cards tests _ the 5700 XT can go up to 9.7tf at boost mode, and manages 4k 30 and even 60 FPS at some games. But those are testings of current gen games! And without RT! So how many Tfs we need for next gen more demanding games and with Ray Tracing at native 4k? Make your bets.