I guess what you're suggesting, but you're wasting your time.
Soon, the project I'm working on will be public and then maybe you can sort the puzzle, if not, you'll still be stuck in your conspiratorial world.
But it should have been so easy by mentioning the project he made designs for you in the past if your claims are really genuine. Don't you think?
Why beat around the bush and dodge the question? Have you been caught lying and now you have no direct answer to his question?