If you read this and got curious here is an independent grower who has been breeding all kind of wild apples on his homestead: https://www.youtube.com/watch?v=YBHqPMK9xM0

6 min in you can see his bright red fleshed (yes, flesh!) apple he is trying to breed out.

Or see this short: https://www.youtube.com/shorts/S4BfgfZ9Kmk