What can this Japanese patent tell us about PS5 backward compatibility?

Enlarge / Giant PlayStation button icons. (credit: Sam Machkovech)
A Japanese patent application recently filed by Sony Interactive Entertainment is being seen by many as a hint that the next PlayStation could be fully backward compatible with PS4 software. However, a close reading suggests the patent could also describe existing methods to get original PS4 software working on the PS4 Pro.
Patent Application 2019-503013 (as discovered recently by the Hokanko-Alt blog) describes a method for 'impersonating CPU ID for backward compatibility.' A machine translation of that patent details a method for 'deceiving legacy application[s]' into thinking they are running on the original CPU they were designed for, rather than a more modern processor. This is done in part to prevent 'synchronization errors' that could 'prematurely overwrite the data still used by another component of a new device,' due to speed differences, for instance.
That certainly sounds like it could describe a way to run older PS4 games smoothly on a pending PS5. But it could also describe what the PS4 Pro already does to run applications coded for the slower original PS4.
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