32 year-old man with dupa hair loss. I did DHI hair transplant, could the transplant be harmful to the existing hair?

I'am 32 years old man and suffering from thinning hair since I was a child I recently did a hair transplant surgery using the DHI method to maximize hair in the center of the scalp After that, I discovered that I was probably suffering from "dupa" hair loss, could the transplant be harmful to the existing hair?, and if the transplant still could be successful? And give some volume to the hair .maybe for a few years or so….