You wrote "literally" twice and yet PS3 emulators exist on PCs weaker than the PS5. Emulators done by people with no connection with Sony.Its literally impossible. The PS5 literally cannot handle the Cell's power.
I'm sure they could do it too and i'm sure they are working on it. They took almost 10 years to give us username changes...they will take time for this too.
Those PS3s won't be running forever and if Sony plans on opening up streaming to more countries (which they said they would) they will need to figure this out.
It's incredible how the badly planned PS3 is still giving headaches over 15 years after it came out. Starting with the hardware and going for their online infrastructure.