Should this German workman have his head in the ceiling while the public hurry past below?

Thanks to Jon for this image, which he took at Munich airport. He describes the context: "Saw this chap working around the public with no barriers excluding him from the public and no handrail/clip for him to protect him from falling off the thing. He was whistling mind which makes him a tad happier than the most of the UK workforce at the mo."

Munich airport worker