The author COMPLETELY mis-understands the heat index and wind chill index. In order to feel comfortable when the temperature deviates from normal, the human body attempts to compensate. It sweats when it’s hot, and it sends more blood to surface vessels when it’s cold. The wind when it’s cold, and the humidity when it’s hot changes the effectiveness of these body reactions. The indices attempt to measure these effects, not the actual temperature. The actual temperature doesn’t change at all.
Better read it more carefully. The author is obviously well aware of the pseudoscience behind “apparent temperature.” Keep thinking. You missed the point.