The headline seems to be focused just on the drilling/tunnel part. Whether a hyperloop is as crazy as SpaceX or Tesla doesn't seem to be covered.
"That superfast train, known as the hyperloop"
Edit: Ah, perhaps the article structure is just confusing to me. It's hard to map which "Tunnel Plan" they mean in the article.
My comment was an exploration of the title "...Tunnel Plan Isn't as Crazy..." Then the article didn't seem to explore any of the crazy aspects of the purpose of the tunnel.
Talking about the "craziness" of digging the tunnel separate from the purpose seemed...odd.
Edit: Appears I may also be confused as to which "Tunnel Plan" in the article title maps to which "tunnel plan" the article is talking about.