Suffice it to say, I don't think an enlightened being even cares whether he's a Ph.D. or not. Perhaps he didn't even put the Ph.D. and Sir stuff on there, but his webmasters and editors. In fact, I think that is most likely the case; other people, thinking that it would be helpful to put the Doc in the best possible light, put it on there, and he didn't notice or bother or cares one way or another. Who knows? Who cares?
I don't think a single person bought his books for the reason that he is a Ph.D. or a knight. I also don't think a single person who has read his books and got something out of them would object to him lying about these things, even if he did lie. So why the fuss?
Don't project your own unconscious belief systems onto others and onto the world. I don't mean this as a personal attack or to defend the Doc, but as a possible area for an honest self-inventory. I feel saddened that your insistence on logical proof and "moral righteousness" (according to your own egoic beliefs) is preventing you from getting the immense spiritual benefit provided in his books.