I'm not familiar with patent legalese, but from my layman skimming of the patent application, I think you're right.

Instead, the patent would cover running object detection/classification ML models — optionally on remote servers — on screen and audio output and user input of specific applications (particularly videogames), without requiring cooperation from the application, to target ads based on what's happening in the application and to decide when to interrupt the application with an ad.

To hazard a guess: Microsoft or part of Microsoft is planning to include pervasive targeted advertising in the next Xbox console OS, including during gameplay of any game.