I've seen that before...
I think its a hoax!
They say British Bikes delayed installing starters for such a long time because these devices consume large quantities of smoke, requiring large, unsightly wires.
Remember,
'A gentleman does not motor about after dark'
Lucas 3-way switch off-flicker-dim
Optional 3-way switch off-smolder-smoke
Lucas invented the intermittent wiper
First effective anti-theft device was the Lucas ignition
I've got dozens of them.