There should be a line prior to this bit, it is implicit, but should be stated officially:

In the event of two or more teams ending the Group stage on equal points, then...

The tie-break rules used in Top eleven for such cases are the official UEFA Champions League tie break rules:

1. Higher number of points obtained in the group matches played among the teams in question
2. Higher goal difference from the group matches played among the teams in question
3. Higher number of goals scored in the group matches played among the teams in question
4. Higher number of goals scored away from home in the group matches played among the teams in question