He has replied to you several times. At some point he will have to stop. You’re not pen pals. You’ve sent footage, he has responded to it, now it’s all in the hands of the AO. The coach can’t tell you that he has or doesn’t have a spot for you. It’s not his decision.
I know waiting is hard! It’s best to put BS applications out of your mind and keep busy with other things. You’ll feel much better!