No, the players choose the player's choice winner and contribute only 10% towards the actual winners.

The games are nominated by a committee, the committee of 'game news organisations' is chosen by the 'advisory board' of the game awards, the board consists of Activision Blizzard, Ubisoft, EA, Sony, Microsoft, Valve, Nintendo, Tencent, AMD, Riot Games, Rockstar Games, Epic Games and for some reason Kojima Productions. So they have the choice to pick their favourable 'news' outlets, which in turn will pick the nominees and the winners of the awards. There's a lot of room for bullshittery to happen and with some past winners/nominees, I wouldn't doubt there has been.