This is poorly described: it’s the Vive Focus Plus which is a standalone headset like Oculus Quest. (And also the branding in general is not great, it has very little in common besides manufacturer with the PC Vive headsets.) It’s not a PC tethered one, it doesn’t use lighthouse unlike the PC ones, and you can’t run steam on it. (It does have room scale tracking, doesn’t use the lighthouses for that purpose, just cameras like most other headsets now.)
I am not sure if the “Vive Business Streaming” tool that I use on my Focus 3 (this is basically the Focus 2) that lets you run steamvr apps on a PC and view them on the headset, would work on this. If so, then that’s how you’d get some SteamVR and OpenXR support. However, if not, then you’re limited to apps written against the Wave SDK for mobile which is specific to this line of devices. (So not many apps). This device does not support OpenXR directly. It’s roughly two generations old: the Focus 3 replaced it (and adds OpenXR support), and the XR Elite replaced the focus 3.
Basically, unless you know that the apps you want to run support the Focus Plus, you probably don’t want this.