If it's 12TF-14TF, I can't believe it'll be an APU, at least not like the PS4. Adored TV does a great job of explaining the new chiplet design route AMD is taking for third gen Ryzen, and this would be the way to go. An 8 core Ryzen chiplet, a separate Navi chiplet, and a separate I/O controller chiplet, all on an interposer. This way the heat from all 3 chiplets is kept separate and only combines on the heat sink on top of them all, which would allow for that kind of performance in a console without it sounding like OG PS4. 14TF in an all in one APU would require one heck of a large cooling system, even if it's vapor chamber based, and you could expect an XB1 sized model at launch. By using the separated chiplet APU style, you could probably get away with a Pro or PS3 sized model.
While I myself doubt they would shoot for 14TF, as the efficiency level at the top of the stack for Navi likely wouldn't be great, I do think they will not allow it to be any less than the 10.7TF of Stadia. That's also assuming it's going to be just one model. If PS has a 6TF-8TF base model for $399, then why not shoot for the moon and try to have the most powerful console as well at 14TF for $599?
My best guess would be the leak is maybe 60/40 give or take. The 40% mostly being up in the air still, so they don't really know and are maybe giving out the highest level those specs could potentially land at, depending on what XB reveals and final price points.
