It seems that the game is not labeled correctly
Notice that there is no logo on the right side of the files:
Compare it with a game of mine that is labeled and notice that it has a logo that indicates which OS it is compatible with.
It is best to notify the developer directly and tell them to read the Itch documentation to verify that their game can be launched from the Itch application.
Why is this happening?
When you upload a game to Itch, it is not mandatory that it be compatible with the Itch application, since you can upload games for platforms such as Android, iOS, etc.
The developer is responsible for adding and checking that their game is compatible, if the developer does not follow those steps, then the application does not know how to run the game.