Not every technical person is (or even can be) an expert in cryptography or goes into a technical field for their career. It's just not practical. This is why our legal system reaches conclusions collaboratively with experts in both the law and the relevant technical fields.

That said, he's got an MS in mechanical engineering from Stanford and a BS in mechanical/aerospace engineering from Princeton. If his technical background isn't sufficient to you, I'm not really sure what to do for you. It seems that you have mistaken him admitting that he doesn't know something as a sign that he is not technical.