Despite what most pre-meds think about the MCAT, it is not a test of knowledge. It's a test that measures your ability to THINK critically.
For example, a typical MCAT passage will present 2 opposing viewpoints on a topic. The questions will then say "if the following piece of information is true: [new information]. How does this affect the two viewpoints?" and then the answer choices are Option 1 is helped more, Option 2 is helped more, both viewpoints are helped equally, neither option is helped by the new information.
This is not just a first order tests of memory. The MCAT requires you to quickly and accurately identify the key differences between the theories, but also understand them well enough to determine how new information impacts them. It may also require suspension of previously known facts in order to focus only on the question at hand (which is one reason why some science majors struggle - they want to bring in outside information which is affects their judgement). The man in the video, most everything they showed, had much more to do with things that had consistent rules and framework. Obviously math is straight forward. Even languages have rules on grammar and syntax. He is certainly very gifted, but it's not clear that this would translate to success on the MCAT.