To clarify some stuff about how the Official Tournament will end up going:
First, here is a layout of how Group Stage performance will result in placement for the RO8.
Second, as you should know, the Group Stage itself will be a round robin. This results in potential situations where ties can happen and where tiebreakers will be needed.
The first way to address ties will be by using point differentials. Essentially if someone is able to win 2-0, they will gain 2 point score differential in their group. If they win 2-1, they only get 1. If you have more point differential with a person you tied, you rank higher than them.
If points and overall performance are both tied, then a tiebreaker game will be used. There are two scenarios for this.
For example, say in Group A you have a situation where:
Player 1 wins against Player 3 and 4, loses to 2
Player 2 wins against Player 1 and 4, loses to 3
Player 3 wins against Player 2 and 4, loses to 1
Player 4 loses to everyone
This means there will be a 3 way tie. In this situation, the person that performed the best in their qualifier will advance as seed 1 from their group. This means that in Group D, the person that got 1st in Qualifier 4 is considered the top seed.
Then, the two other players will play a BO1 on a map that will be decided by the TD. Then, the winner gets the 2nd seed and the loser fails to move on.
In the case of a 2 way tie all that will happen is a BO1 game to determine who gets which seed.