The Medium is the Message Response

This article was quite the read. It seemed very fragmented to me, and had a lot of passing remarks about random figures, such as, Louis Pasteur - the man who first discovered germs. I had to search around a second time to try and decipher any main thread of thought. However, there were many very interesting remarks that he made.

One of the most interesting, yet obscure, insights that he brought up was focused on the I.Q.s of the British politicians in the 1930s. On page 158, McLuhan is citing to a situation written in a review by C.P. Snow of A.L. Rowse's book Appeasement. Rowse asks "Their I.Q.’s were much higher than usual among political bosses. Why were they such a disaster?" Snow's response to this quandry was, “They would not listen to warnings because they did not wish to hear.” McLuhan synthesis of these two points that "Being anti-Red made it impossible for them to read the message of Hitler." This is a very short paragraph of his work, and had me very confused at the end of reading it. I know he is talking about the cultural bias in I.Q. test and they are not accurate because they are only meant to test people who are visual learners as opposed to the "ear man and the tactile man"(Auditory and Kinesthetic learners). There is also a point where McLuhan claims that literacy is a technology in our society and that it is universally uniform in all levels of government, education, politics, and social life, and doesn't differentiate it self for those outside the norm, which has lead to major problems for people who find themselves on the fringe of the status quo.
This still leaves me with two questions.

1. Is McLuhan inferring that since literacy is a technology/ medium would I.Q. test be its content?
2. Since I.Q. tests are flawed in their execution, should their results be deemed false/ inaccurate, and the test either be eliminated or revamped to be less visual and more balanced to accommodate different learning styles.