As far as rumors go, this one really isn't all that out of left field. Earlier today, Tyler McVicker of Valve News Network, suggested that a VR version of Left 4 Dead is real.
That's pretty much it. That's all he has to say on this particular matter: "Left 4 Dead is real." Oh, ok. Unsurprisingly, he dared not share anything additional to back up his claim.
Of course, saying that Left 4 Dead VR exists really isn't that...