It's still in development, but it's a far cry from vaporware, and it's already being used in production at at least one company.

pekk isn't saying Rust is vaporware. The meaning of pekk's post seems to me to be "Since Rust is almost never used in production, outright vaporware would allow people to do the same thing they mostly do with Rust: not use it." In other words, Rust has not yet found a niche, so you can't supplant it in a niche it doesn't yet exist in.