So I guess I'll ask stupid question back. Did he get it started?

But seriously, all 4 strokes need a glowplug and starter. It was probably a remote glowplug starter attached to his glowplug.
Simply a socket over his glowplug that has a wire led back to a 1.5 volt battery most likely in the fuse that is controled by his
radio throttle.

At least that is my best guess.