Full credit to the Purser for handling the matter in such a decisive & professional matter ^
It's no bad thing for an airline (or indeed any commercial organisation) to send out this sort of message when appropriate, and to thereby redress the balance of unwarranted expectation. A growing number of people have somehow developed a distasteful sense of entitlement to things that others choose to pay for.
If Emirates exercise their discretion - as of course they so often do - to provide additional/enhanced facilities as a gesture of goodwill, and/or in recognition of loyalty, then all well & good. The problem comes once people make demands or, in this case, even resort to deception to cheat their way to a service to which they have no right.