Looks like we can expect some photos of Korean airport officials with bowed heads (or is it only a Japanese thing?). Been reported in Korean media apparently that this was known about as a safety risk and that there was a recommendation to remove it.
London city appears to have this structure at one end (the other end has a runoff that ends in water). There's a definite curve to this wall, I wonder if it's designed to take at least some sort of impact?
Re London city airport, trying to claim it's like a larger airport is a bit odd, as IIRC London City airport is quite restricted in the types of aircraft that can use it. Not all airports are rated for all aicraft and a lot of airports with immovable objects or special circumstances (IE maintains or the sea at the end of the runway) require additional training and special approaches.