I've already explained that this is not true. Repeat yourself all you like, you're just more wrong. The PS4 version was not developed and released separately to the PS5 version, constituting a schism in the available feature set. The PS4 version cannot enable features its platform doesn't support, but the feature is developed, ready, and paid for none-the-less. Ray Tracing in PC doesn't cost extra. Ambient occlusion doesn't cost extra. So, either you know nothing about application development, version control, platform recompilation, or modern game development in general - in which case, why are you talking about something you clearly don't understand? - or, you're being deliberately dense for the purposes of a poor man's attempt at justifying unjustifiable price gouging by your favourite plastic box.
There is no justifying $10.00 "next gen upgrades". Period.