We dont know how RDNA acts in syntetic benchmarks. We do know Vega56 ~ 2070 in 3DMark, yet 2070 is much faster GPU on average.The thing is, Gonzalo with just 8.3TF GPU would never beat vega64 score, and especially considering PS5 was using unoptimized drivers (unlike vega 64) for windows and 3dmark. Gonzalo 3Dmark score suggest at least 10TF GPU in PS5, therefore your 8.3TF estimations must be wrong.
One thing I saw few days ago was syntetic bench with 5700 being 3% of RTX 2070, yet its only big Navi XT, with 2TF more that is competing with 2070.
My point is, 20K is great score, but with Zen2 6 core @ 3.4GHZ beating same specced PC with 2700X, it might be that Zen2 scores a bit higher then old Zen+ and AMD continues with solid synthetic scores that get outperformes in actual games.