Hello good sir. It would be best to watch the AMD stream before coming out with such questions/facts you have stated.
BOM article by Forbes is more like a estimate by the author. It was not a definite fact. No such breakdown on each parts for each consoles (PS5 and Xbox Series X). Take that with a pinch of salt.
As such we cannot refer to that as a source. Just speculations.
As for github, it might be accurate at a certain point of time (possibly PS5 2019/Early dev kits) but with AMD saying that both consoles are RDNA2 as per their slides, it is therefore questionable right now.
If rogamer was correct with his tweet which includes details of Ariel and Oberon, then its almost in the bin as that data for the chips are based on RDNA 1 / Navi10 lite. That is also included in the github leak as well.
I am not sure why you are questioning on those points. (on PS5 being on RDNA 1 or 2)
As for the 9.2TFs, it is still within speculation though i am more inclined that it would be higher than that. Have a look at the table below for Navi21 (as both consoles, PS5 and Xbox Series X are based on RDNA2)
Number of estimated CUs it could have is more than github data. I dont see any reason why Sony would be limited by this unless it is not within their set budget on the SOC.
