It sounds like IWSF differs from AWSA regarding the criteria regarding scoring buoys. I see AWSA seems more lenient by disregarding the Skiing Position from scoring the buoys.
From AWSA rule book:10.12
C. 1 point when the skier has crossed the line of the gate buoys before passing the level of the next buoy with a tight line under the power of the boat.
D. For judging purposes, the front foot of the skier shall be used to determine the point at which the skier crosses the quarter, half, and full point buoy lines (or the end gate in case of the final buoy).
AWSA Rule book page 60
I feel clearly that based on AWSA rules he scored 2 because Skier Position is not a factor in the AWSA rules.
Given the event and IWSF rules, it would help if IWSF had a D reference regarding the tip or the front foot for clarity for the judges. I feel that using the tip of the ski would certainly go to the skiers benefit but even the front foot appears he scored 2 based on the rules he sighted but its pretty darn close.