How does he keep his job?

I've wondered about this before - how does someone like this, in the upper echelons of the Canberra public service, manage to keep being appointed by both parties when they are in government?:

Ok, well he doesn't use the word "lie", but clearly he is saying his department specifically misinformed the Minister 7 times (!).   So much for competence.

Hasn't Bernard Keane complained for years that Pezzullo is bad news?   Is his corporate knowledge that invincible?   Sounds like completely fresh blood at the top of the department would do wonders.