Why would they be reviewing a game if they can't do it. This is more or less the system itself doesn't work for the person. Applying it to the game as a review would be ridiculous.
Its not uncommon at all to have publications give a review of a game to somebody who isn't part of the fanbase already. If that was the norm, video game reviews would become even more of an echo chamber than they already are. There's a balance, sure, but Alyx isn't in a very niche subgenre like visual novels that are adapted for NA or EU markets. It has decently broad appeal outside of VR and thus shouldn't only be reviewed by people who are ingrained within the VR ecosystem.
Of course if the reviewer isn't responsible they may criticize the game more harshly than it deserves because they aren't accustomed to VR, their body doesn't handle it well, whatever. That would be unfortunate. However, if VR is going to break into the mainstream we have to allow new people to experience it and talk about it and not automatically consider their opinions invalid.
So I imagine there will be a few reviews that score "low" (80's) because the reviewer isn't used to VR or there is some aspect that hinders their enjoyment that many who are used to the systems wouldn't find an issue. But doesn't that occur in most reviews? There is some aspect of a game that many who like the genre are accustomed to or don't dislike as much?
So I'm guessing in the low to mid 90's. Not best of all time.