The bottom of the page there is a countdown that will expire at midnight Eastern standard Time tonight.
This company claims to be in Boston. They've received federal grants. I've done a small amount of digging, but it would be entirely within valves resources to set up such a company. They have a LinkedIn, but it doesn't really seem like anyone really works there? It seems like a viral marketing campaign.
There was a Reddit thread. A while back. Some people noticed classes in the HTML that referenced other half-lifey things. But, some people in that thread shut it down as nothing out of the ordinary.
Then, there have been recent leaks with regard to a new game being developed. Someone found a resume suggesting that a person had done voice-over work for an unreleased project with Valve in 2023.
There was also a leak of some files with .hlx file types, and I guess prior to the half-life alyx release some .hla files leaked.
In the .hlx file leak, I guess there was found references to things like the EV suit.
Here's a YouTube video that touches on all of this.
https://blackmesa.com/resonance-cascades
This article on their site explicitly states that they are a real biotech company in Boston not associated with valve in any way. Sorry to be the bearer of bad news :(