Would the Crown solicitor have appealed a discharge without conviction if the prince had been Harry Windsor instead of Korotangi Paki? Would anyone - prince or pauper - in that circumstance have had the Crown appeal such a minor incident of lower court discretion? Of course not. The appeal was a reactionary measure of populist racism designed for media consumption, but the political implications are that the NZ government is opposed to and is set on undermining the Maori King movement.
The NZ government demonstration in this case is not that 'no-one is above the law and everyone is equal before the law' - because that is patently false if we ask ourselves what would have happened if it was John Key's son, or Prince Harry - the demonstration is that no Maori is above the law. White people in a position of privilege however can still do whatever they please with little consequence.