Ok fair enough, but it still the same with Engrish. There is plenty that is correct and they clearly are intending to be correct. They could do what you suggested earlier and check with someone, however it still comes down to their intended audience. The photographer knows who he is making this for. The creators of Engrish goods know who they are making their goods for. Both are certainly intending to be correct, but they both know it doesn't matter enough to their intended audience to make a special effort to make 100% sure it correct. This is the assumption in the general case, it may not apply in every case or even to the Nihon Noir in question, but to me it helps explain most cases of Engrish (there are other factors of course) and even cases of reverse Engrish as in this case.
I said precisely the opposite - that it's down to the designer's intent.