Well there is no concrete evidence the Ps5 gpu is 9.2 tf its pretty reasonable if it wasn't so overclocked thats what the base tf would be. Add the github leak that the ps5 has the oberion chip which is 9.2 tf before the Ps5 was released and makes even more sense.
I think Sony was originally going to have a 9.2 gpu running at 2.0 GHz but upped it last minute because the underestimated the 12.1 tf Series x was putting out. They upped the clocks to get a double digit tf number. I think they had to redesign the cooling system to accommodate. I believe this raised the cost of the ps5 production. It would have been cheaper to just up the gpu but it was to far along in the process.
Its all speculation. The real question is will a higher OC and a weaker gpu effect fps and res. Most of Sony's games at the reveal were running at 30 fps. Phil has already said you will see a difference of the Series x power during the July reveal in fps. At the Microsoft reveal if most games run at 60fps /4k vs just a few a the Sony reveal it will be a big selling point for the Series x. We will have to see.
I believe this as well