If I should guess such kind of article pops up around every half a year since I'm following Hacker News (I have an account since 4 years so more than that).
Some even came from people much higher up then this person seems to have been.
My guess is that they have a policy against it, but normally either don't hear about "private support" or don't care about it. But do use it to get ride of anyone who thinks differently in the sense that they don't agree with everything Apple does, like complaining to another employee that it's petty of Apple to sue some small company with a peach logo.