No-one has mentioned it because it is on the charts as a Danger Area with symbol (since either June or November last year).
Woops! Just went back and checked, it has been marked since the November update. Before everyone worries, I haven't flown that VFR route since being on the June charts! There was at least an update or two that didn't include a marking and people had to rely on NOTAMs. It also from memory wasn't included with an airport but in the general FIR NOTAMs that we all know, people sometimes forget to check.