That's just wrong Avet. The ps5 and Series X are far faster in their ssd streaming pipeline than any PC. It's not even close. It's more than just pure speed. It's latency and reduced number of CPU cycles that don't get shown. You can argue that all you want (you'll be wrong) however Tim Sweeney has already gone over this and as well as Mark Cerny and to a lesser extent in Spencer's Xbox Reveal. It's kinda the whole point of next gen consoles that MS/Sony have talked about. MS is even bringing their tech to DX12 in software trying to emulate what they did in optimizimg the Software/Hardware pipeline for the Series X.
On top of this there is no reason for MS or Sony to lie about the speeds. They are using off the shelf components and are user replaceable. In Sonys case they are just a little ahead of the curve.