Epic founder Tim Sweeney revealed that, even though the features unveiled in the Unreal Engine 5 demo will work on all next-gen platforms, the company’s engineers have been working ‘super-closely’ and for a long time with Sony on PS5’s storage architecture and other elements.
Source: N4G PC Epic Worked 'Super-Closely' with Sony on PS5 for a Long Time, It's Been a Primary Focus – Sweeney