Think of it as a process of coating the acid molecules with a hydrophobic barrier. Often times different kinds of oils are used. This barrier is now going to try to repel any moisture, with the acid trapped inside the barrier, the hygroscopic properties of the acid are significantly reduced so that it will be unable to pull moisture from the air or the gummy. This helps to prevent the gummy from getting soggy or sweating or developing a wet exterior.
Capolan will be able to provide you more information, and they have several different encapsulated acid products, I think I have 4 or 5 at home that I was playing with. I had mixed them in different ratio’s with sanding sugar and used that to coat my gummies to provide a more sour taste. It worked well.