I noted that the low score might not have mattered.. But it the French judge had scored fairly, that score may not have been the lowest. That would have won it for the US. Also whose to say the French judge didn’t influence the other judges? Or at least one? In my experience judges of all types tend to stick together.
If the French judge’s low/high score was tossed, my bet would be an influence over the Spanish judge, who I believe placed the American couple 3rd, when all others had them 1st or 2nd. But the French judge (& several others) also barely deducted the French pair after they had a clear bobble on their spin/twizzle move (which is the main complaint in skating aficionado commentary threads). A previous pair with a similar mistep was clearly deducted more harshly.
I placed the Americans first (they had an expressive storyline throughout the routine, with the female acting as a matador) , the Canadian pair second (joyful) & French 3rd (routine seemed dull and seemed that he was carrying/dragging her about a lot more than others)