Mind you, posting your video on a public forum with your phone showing you going at 20 mph, I can only assume that you were so scared you were on adrenalin and the motor was completely off at that speed ;-)
When did I do that? My DPC-18 is set for km/h, which can be seen if you pause and zoom/screencap zoom in while playing any of my vids (there's a 1080p setting in Vimeo) when that small region of the display is visible. The only time I exceed 25km/h is downhill, after assistance has cut off. Not guilty your honour.
Oh and occasionally I manage to exceed 25km/h using leg muscles (my own), after assistance has stopped at 25km/h - I do that to get a bit of exercise, because otherwise I don't get any whatsoever because of how I've set up my bike'sfirmware, because I like to arrive at work not sweaty and in need of a shower.
EDIT: From unadulterated footage:
Downhill (aided in large part by gravity)
...downhill with more tyre pressure. Rock steady Dahon Helios P8 folding bike