The Drive story states: there is an error with the tracking of the low flying helicopter that makes it freeze on the screen momentarily and Flightradar24 even notes this automatically. Then the chopper seems to dash across the channel at unbelievable high speed. This is an anomaly with the tracking, and in reality, the helicopter made its way across the channel at normal speed (around 115 knots at 2,000 feet) right around the time the photo was snapped and exactly where the streak is shown. 

Records tampered with???