There's 4 reviews that are clearly labeled XB1. These reviewers all gave out scores for the XB1 version, even though it was in early access.
A year old port to another platform is not a major release. And if you think it is, then where is Dark Souls for Switch? Where is Disgaea 1 for Switch? Where is Labryinth of Refrain?
Regardless of it's a port or not, the game has had over 8 million players on xbox (prolly about ~7 million copies sold) and is regularly on top of Xbox's charts. By all means it's a major release.
And those are only 4 reviews. Majority of the reviews will come after 1.0 releases.
Even then I'm talking about metacritic and not opencritic, which has 0 reviews: http://www.metacritic.com/game/xbox-one/playerunknowns-battlegrounds
And I did list dark souls on switch, at the bottom. And no, niche japanese games aren't "major".
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.