If taken seriously, this should cast serious doubt on their decision-making on such matters. But its clearly not meant to be taken seriously. Instead, it's a casual "fuck you" response from the self-proclaimed "most open and transparent government ever", and an example of their obsession with secrecy and reluctance to release anything if they can possibly contrive an excuse not to.
I mean really, would it have killed them to just point at a dictionary? And would it really have taken them 16 working days to do so?