I'd rather have 7/8TF RDNA2+ with advanced and developed RT logic, then 11TF pure raw power. It is not very realistic to expect both, if you want that get RTX3080 or whatever AMD by next year. Just cause he's indentified on neogaf doesn't mean he actually is in the position to claim or know how many TF's the consoles are going to have. I think the whole Stadia 10+ TF thing has something to do with it, but Stadia was on another architecture, which will age faster compared to PS5's more advanced 7/8TF's (if it's in that range
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He's not lying if they were on 10TF of pre- Navi though, and betting on next gen console TF's is a bad idea anyway as even Sony themselfs probably haven't finalized the GPU clocks, CU numbers etc.
It's a no-brainer that they are going to have around 16GB for games atleast, not a dangerous bet there, the SSD solution will be very fast too sure. No idea about Vulkan but AMD hardware has an advantage if both consoles are using it. On TF numbers, offcourse i want 11TF or more but seeing how AMD's highest end isn't even that now, just a year before launch, and that thing doesn't even have RT onboard, on a older architecture then what the consoles and gpu's then will have.
Like said, expect RX5700 ballpark performance with ray tracing and you won't be too far off, whatever TF number that might result in.