But that's completely wrong. You said "running the game on the engine itself". The game isn't "running on the engine itself", it's running on Windows.
And you cannot name a single example of that happening. You're basically telling us Square wasted thousands of man-hours developing a PC version they'll never use, because why?
Except that there is a working Windows version that runs well. If there was no intent on porting the game to PC, the developer would have never bothered going to the lengths that it takes to have the game run properly. That final 20% to have the game not crash, bug, and render like shit is the longest and hardest part of the development. Square wouldn't have done it unless they're working on a PC version.
Plus, why would they show a PC version instead of the PS5 version that should be much further along? Your arguments make no sense.
Here is what the team who ported GOW to PC said:
But according to you, it's as simple as pushing "Play" on their PC editor and have the game run. Sure.