It appears that the modified win has been removed from the rules in the new rules update. It still lists the point value of a modified win, but they removed modified win conditions: "The player with the greater score receives a win, and his opponent receives a loss. If the winning player’s score is fewer than 12 points more than his or her opponent’s score, that player receives a win." Has anyone heard or seen anything to suggest that this is just a typo or are wins just wins regardless of margin now?

Someone on the general board said they contacted the OP twitter account and it was in fact a typo.

Yup, it's a typo. Here's the twitter conversation where they confirm it.