I can't help thinking this was a put up publicity seeking exercise (with him not quite realising how stupid it would make him look).
It was senseless to chain a cycle to a 3 ft high bollard when all that was required to do was lift it up. I understand it was chained by the frame, rather than one of the wheels so that it was easy to ride away.
More mysterious, though. Where were his entourage of minders and bodyguards who travel in close proximity?
Am I correct in thinking that your link goes to an eBay site?. ......
Regarding chaining items to posts etc, it was always a noted thing, that if the post had no large blocking projection at the top, then it was pointless using it as a safety- security device, irrespective of height.