This is not unique , generally spotted easily by ATC when the pilots query the instruction or just read it back... I never heard of a serious incident anywhere as a result. The perpetrators are generally caught fairly easily or should I said used to , as this one apparently took a few months to catch., which is very unusual. That is perhaps the news bits here.. The Germans have a special unit for this , very fast and very efficient ..probably a left over from the experience they gained during WW2 against the resistance.
