There's almost no chance it isn't using rejected PS5 APU dies. It has fused off two of the eight CPU cores, as well as 12 of the 36 GPU compute units, but otherwise has the exact same specifications. The one customization Sony did get, the use of GDDR6 RAM, is still present. It also exhibits the same very short-lived mix of Zen 2 with RDNA 2 and has the same die size and aspect ratio.