Mate you have misinterpreted the AIRCDRE. By all through PC21 he means all through from basic - as in the CT4 is no more. He talks about the future of Hawk with the Hawk LIFCAP (Lead in Fighter Capability Assurance Program), ie iis a current software upgrade to the Hawk127.
Regarding the 2 previous posts - I would say that vonNoobie is more on the mark than AD... keep in mind that for example a FLTCDR (any platform) is anywhere from a 10-15yr project for the RAAF (probably 12-15, and I imagine similar for RAN/ARMY for similar capability people). You cannot replace that with recruitment. Retention is the key. The problem for the ADF pilot stream at present is the high number of airline Jobs both in Australia and overseas (SEA/China/ME) along with Military contractor jobs (Saudi/UAE/Elsewhere....), all of which are paying significantly more than the equivalent ADF pay.
Small correction, AD mentioned 'retaining' not recruiting. That being said recruiting could very well become a viable option not so much in the case of raw recruits but poaching qualified personnel from other nations (Canada will be reducing it's fleet so might be a few dozen pilots alone to have there).