From Liquipedia:

Attack All Around did not turn up in time.
However, an estimated average rounds will be given to AAA through this formula:

Sum of all Grp.stage Victory round diff / total number of Grp.stage matches
then rounded up to conclude the avg. rounds
After the final Grp.A match, This match results will turn into a regular 13-X win

if you're asking why, idk maaaaan

edit: nvm they're playing a tiebreaker now because apparently the teams tied under this formula anyways uhhhhhhhhhhhhhh