They have a web site.[1] They claim to be hiring. They claim to have funding. The web site looks like someone loaded up the generic cool new startup template and stuck in some concept art in the indicated places. There's no useful information about the technology or the business.
The big problem with this is not the technology. It's land acquisition. As with high speed rail, you need a right of way that's straight or has very large radius turns. There are sections of I-5 that are straight enough, but high-speed travel between Bakersfield and Tracy isn't that useful. Tunnels can help, but are not cheap.
China is building high speed rail through urban areas on pylons. As with most elevated rail, the reality is much wider and more heavily built than the concept art. (China's maglev is a one-off demo; China's high speed rail system is huge.)