It seems even more likely that Bethesda's current Xbox console exclusive Starfield will launch on PlayStation 5.

Because you're no longer building for Xbox ERA system, which is what the developer environment is called of the current Xbox, it's ERA which is I believe stands for 'Exclusive Resource Access"and ...

The PlayStation logo has been spotted on Bethesda's official Starfield Creations mod site, suggesting a PS5 release could be coming soon.