He’s definitely male.
Do you know Oscar personally? Not trying to be flippant here; just curious. Because I just g**gled some other images of “Oscar,” which also show the orange patches, and also show a kitty with feminine features. (Smaller nose, etc. Though that could be a male who was neutered very early.)
It has been my experience that people often use “he” and “she” for cats pretty much at random. I have a friend who has a cat who is CLEARLY a neutered male, yet she persists in calling the cat “her.” The people who named Oscar may have been similarly haphazard. (Or okay, maybe he’s a male calico. They do exist.)
I should go to bed. Sleep deprivation is clearly making me obsessive about kitty gender....