Guys Sony have made several patents on their costum SSD solution, several very knowledgeable people have looked at those patents, it's a single-tier-solution (no hhd+SSD combo) with speed estimate between 5-10 GB/s. Now about Mark Cerny statement, the fastest SSD at that time was Samsung evo pro 970 which has a 3,5/2,7 GB/s speed.
6x master league achiever in starcraft2
Beaten Sigrun on God of war mode
Beaten DOOM ultra-nightmare with NO endless ammo-rune, 2x super shotgun and no decoys on ps4 pro.
1-0 against Grubby in Wc3 frozen throne ladder!!