can i publish my game on the PS5 and on the PS4 ?

or do i need at least UE5 for this because i want to make a game that runs on PS5 and PS4

If you want to publish on the Playstation, you still need to be part of the Playstation developer program and purchase a dev kit from Sony.

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We spend a considerable portion of
each release focusing on improvements
to support all platforms so your
projects can be experienced by
everyone regardless of their chosen
form factor. In this release, we have
added support for the next generation
of gaming consoles, which include
Microsoft Xbox Series X and Sony
PlayStation 5.

Yes i know that