All recent PM’s have set their own salary, and for politcal/vote touting reasons they deliberately set their salary well below the market rate. If they allowed their salary to be set by the review body it would be close to double what the current PM is paid. However any PM, let alone a young one,is fully aware that a) they’ll never have to put their hand in their pocket while they are in office and b) being a former PM is massively more lucrative than being they current one. Their future finances are not something they have to worry about. That makes it an utterly meanlingless bench mark to compare any other public sector salary to, i’d even go further and say its a deliberately deceptive benchmark to use.
It works though, 3 pages of internet banter hours before the show has even aired. Its the model of contemporary current affairs programming – encourage the audience (even the people who probably won’t watch) to form and voice their opinions first, then possibly learn some facts later.