Only the following fruit tree types spawn in the world:
Almond, apricot, coconut, pinenut, orange, lemon, gooseberry, avocado, apple, banana, fig, date, candlenut, cherry, dragonfruit, chestnut, nutmeg, durian, cashew. When disabled in the config, they still generate. Other fruit trees do not generate in the world, whether or not they are enabled in the config.
This was tested on clean install, with just phc2trees and Forge. Version pamhc2trees-1.15.2-1.0.5.jar
Forge version 31.2.30