1) Elon Musk is not building any Hyperloop, so I don't see how its supposed failure reflects on him.

2) Which Hyperloop is failing? There are at least three groups, and as far as I know, they haven't even got close to testing the system, let alone know if it's a failure or not.

I'm skeptical of the whole concept, but declaring failure at this stage is no less silly than assuming it'll definitively work.