Though the way the leaker describes it makes it sound more like a 3rd person MOBA than a hero shooter.
Valve hasn’t released nothing but tech demos since Artifact, and that was a huge miss. And excluding Artifact, Valve hasn’t released nothing but tech demos in over a decade. So you could say Valve hasn’t hit the mark in over 10 years.
Alyx came out 4 years ago, and is recognized as one of the best VR titles of all time. It’s a full 15 hour game, so not a tech demo. I’d say that’s a hit.
Alex is a tech demo designed to sell headsets.
It also was unplayable for me made me sick and I can play things like super hot or beat saber for hours