*sigh*
Lets looks at the process of Buying PUBG on Xbox from the windows store.
Xbox.com shows the game with the tag
Xbox Game Preview Available now
Clink link to details and at bottom of next screen:
Game details
From the makers of the best-selling PC phenomenon, PlayerUnknown's Battlegrounds drops players into a competitive survival battle where you’ll engage in a heart-racing fight to be the last player left alive. Loot supplies, find weapons and gear-up to take on the competition in a solo or team squad match. Emerge the lone survivor in a thrilling game experience full of unexpected, adrenaline-pumping moments.
Game Preview: Game is unfinished and work in progress, may change over time, and may not release as a final product. Game preview information at xbox.com/GamePreview. Xbox Live Gold required to play (sold separately).
It also has right above 'buy' button "game preview edition"
On the final screen before you confirm it shows this:
The 'Preview' on top there will stay on the game and on it's tile on Xbox One until it's actually released.
Now if you are literally too stupid to think it's not preview then I can't help you. Nobody who bought the game didn’t realise it’s in Preview.