True, but he has little talent, and his success is almost purely a combination genetics and hard work (eating + training).
You don't think that there is significant technique to be mastered in world-class athletics like that?
There are of course some techniques like how you set up at the line, but running is one of our most basic functions. I am not a professional runner, but I really would expect high level running technique to consist mostly of fundamental 'dos' and 'donts' (i.e. what many sports would call 'good form'), rather than secret techniques and tricks that take old sages decades to master.
That's mostly the trainer's job, I would think.
Mostly the trainer's job to hone technique, despite not competing? That doesn't sound right. You might want to make your point more explicitly.