The N is not replaced: it's there from Surinam!
IMO (sorry, LIK!) certainly not nonsense, just a little unusual.
Compare the ingenious AND amusing word-play in this puzzle (almost everywhere) with the clever-clever, convoluted but NOT amusing word-play of other setters & you'll see why Ar. is still so popular. Just a little imagination & generosity necessary.I prefer this kind of liberty any day to what most of the others offer us regularly: they may stick to the rules religiously but the effect is often anything but entertaining! Can we agree to differ at least? The word "nonsense" is grossly exaggerated & unfair.