So PS5 and XBSX perform basically the same again.
8-9 TF overclocked RDNA1
vs
12 TERAFLOPS FULL RDNA2 POWER VRS VRR SFS ML DX12 DXR SUSTAINED PERFORMANCE
And its the fucking same. Silly times.
It's only surprising if you don't understand the way those machines work. They're not PCs. They're not similar platfoms where only GPU is different. PS5 (which is neither RDNA1 or overclocked by the way, but I know you're joking) has tons of customizations that competition doesn't have like custom geometry engine allowing to cut a lot of useless work, custom I/O, variable frequency, higher system clock affecting everything, and so on.
Teraflops don't mean shit, a lot of people explained why, but nobody listened for some reason. Everybody preferred listening to uncle Phil's ads, probably because they gave a single number (unlike Cerny's video that nobody understood but actually explained everything, ironically). It looked so simple and it's well known ads don't lie. Well, here we are, right now they don't even perform the same, PS5 has been performing slightly better in majority of games and in every recent comparison.
Those are just two different platforms with different design choices. There's no reason one would be inherently superior to the other, it depends on tons of parameters.