From the look / sounds in the video:
A. The bike didn’t have its steering lock on. Or not one that needed to be forcibly snapped. The usual and easiest method to snap a steering lock is to sit / lie back on the seat and give the bar end a sharp kick.
B. Didn’t have a disc lock, or not one that the thieves had to in any way struggle to remove.
C. One of the thieves, who comes in first to check the bike out, can be heard to say, what sounds like “Nothing’. I take this to mean, no security. Timed at about 0:12 to 0:14.
D. The sound, is that of the side stand scraping. One of the thieves can be heard to say: “Put the stand up”. 0:28 to 0:30.
E. The only thing the thieves struggle with whilst pushing the bike away, is that the bike is in gear. 0:36
F. There is a motorcycle (and a third thief) out on the road. You can see it roll forward, probably propelled by the rider’s legs, as the stolen bike is pushed alongside. It is the sound of the bike on the road being firing up, used as a ‘slave’ to tow the stolen bike away in neutral, that one hears. It’s the most common method of ‘push away’ thefts.