The fundamental theorems of calculus aren't even really complex. If you had a decent math teacher, you should be able to figure them out well before you get to that section.

Almost like education is structured to build up to certain concepts and gives you the tools to understand each successive part of the curriculum.

But I don't think this guy is telling the truth, unless he counts learning that multiplying time by speed gets you distance as "discovering a fundamental theorem of calculus"