It looks like there are two entirely different sets of concerns here. One concern is the technical feasibility of Hyperloop; your concern is to justify your hero-worship of Elon Musk.

Personally, I find it questionable that an automobile entrepreneur is choosing to publicize this concept but invest nothing into building it himself, as if to spread FUD about high speed rail. Calling Musk out for that and for not showing his work when it comes to costs and numbers is appropriate whether or not it offends your hero worship.