I think that’s a slight pun.

The “-archy” part comes from the greek for “to rule/command”. Monarchy = rule by a king, oligarchy = rule by few, etc.

And the “an-” part means “not” or “without”. So anarchy technically means “not ruled” or “without rule” - but if things are still being ruled, it would still be an “archy”, not a “not archy”.