Let me explain it to you then.
I'd by far trust the words of the folks who designed, built, and tested (the treating Doctor) a plane before I'd trust in some authors (Doctor on the other side of the planet not treating patient) ideas of said plane.
You would be making a HUGE (and very ignorant - sorry to have to say it) mistake in this case. Johnson and his group were working on an aircraft that suffered from a problem that would not be realized until 1947 (aeroelasticity) by a man named Arthur Collar. In this case (that you are attempting to besmear) you are ignoring the fact that Phillips has instructed aeronautical engineers for some 30 years and the text I cited is
the standard post-fundamentals text that not only explains phenomenon in detail but exhaustively researches the fundamentals behind aircraft performance and then derives all of the supporting equations from the ground up. Phillips also defines formulas to be used in the creation of flight simulators and I feel confident that many of them are used in AHII.