That is neither vaporware nor BSing because Musk never suggested he was going to build the Hyperloop. He explicitly said the opposite, that it was an idea he thought was neat and he hoped somebody else would work on it.
Huh? Musk gave away the idea, never said he was himself going to do it.
But in spite of that, technically, Musk has already built a subscale Hyperloop nearly a mile long at the SpaceX campus in Hawthorne including an electric sled used for student competitions: (epilepsy warning) https://www.youtube.com/watch?v=moeI8DxQR5Q
Hyperloop though..
I mean, I think bullshit can be sold to even 'techies' aka HN crowd, if it is wrapped just the right way...