How can you declare a game the game of the year when there are still a few games to be released that year after it?
That said, Emmy's go by a July - June period for their awards. So, their best of the year isn't an actual calendar year. Oscars are in February and they are going by calendar year release date/showing in an American theatre. Game Awards are so close to the end of the year, they might as well go for the full calendar year instead of the early cutoff but then that might put them in competition with all the other entertainment award shows that happen at this time of year. If Emmy's can do a different time period requirement then the Game Awards could shift the time they judge as well. You just don't call the winner the best of the year but simplify it to Best/Outstanding Game similar to Best Motion Picture or Outstanding Drama Series.
Also, highly sure that RaymondPa is a spambot so I wouldn't worry too much about its thoughts.