I'm not enough of an expert to just step up and say he's wrong, but if the fans are kicking on at speeds above 20 mph, then I think there are cooling issues beyond just fans. The fans are supposed to be for stop and go street driving. Perhaps a use if you're racing and in a draft behind another car, so you need a fan to draw air since there isn't positive pressure at the mouth.

My wife's stock 2000 once overheated in 55 mph traffic w ac on because one fan's relay failed. So fans do help at speed.

Fans turned on at speed mainly reduce the resistance to airflow that they would produce when not powered.

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