That story seems very strange to me. It keeps going on about the physics and the math of these sports, but it never actually describes any of it. It's impossible to know whether these are credible calculations or not.
Of course, there are striking examples in sports like american football or grand tour cycling, where they have specialized athletes of different sizes for each position. But unless you are planning to make a career out of it, you should be guided more by what you enjoy than what you're best sized for.
It's very strange to me, when I hear athletic young people talk about not being able to "make the team" in their high school. Where I grew up, most of the schools were so small that if almost everyone didn't go out for a sport, there usually weren't enough for a team. Maybe not everyone got to play a lot, but I never heard of anyone getting cut from a team for not being good enough.