"supports" as in I see articles in the PC gaming press about technical problems with From/Kojima games a year after I've finished said games on console with zero issues.

Where is Windows Proton like for Playstation APIs?

"Technical issues" has many meanings.

The point is, "the platform those games were designed for" is the Playstation API for some titles. So you'll get the best experience on there.

Unless you play benchmarks instead of games, and care about 8k/1200 fps of course.

The point is, the game uses the platfrom APIs on the target OS, and doesn't need to emulate API from 3rd party platforms.