Correct. Look at it this way:
If this were a tactical situation and you had done no damage to your enemy they would have come back after you managed to take a key objective.
Wiping an enemy out would have had a stronger effect.
From the rules agreed upon by everyone at the offset, to win the league you need to both win and crush your opponents. Only considering Win, Tie, Loss with 8 weeks of games would not have yielded a clear victor.
Also, recall that this league is and was structured in a manner to lead into a grand tournament. Hence its rules should be and are similar to the scoring you will see there.