Is the ginkgo fruit that can't be peeled off immature?

no. The main way to distinguish the ripeness of ginkgo fruit is to look at the color of its skin. The skin of immature fruit is green. If the fruit changes from green to yellow, the red in the yellow is ripe and can be picked, and it is not immature if it cannot be peeled off. Because ginkgo trees grow tall, tools should be used when picking, and the picked fruit will peel off its skin to reveal the white fruit inside, that is, the peeled skin will smell stinky.