Define "expert", define "employed"

I posted a comment to Crikey about a correction that Henry Ergas made to a claim by Crikey. The original statement was "Despite the blatantly partisan nature of his columns, neither Ergas nor The Oz feel inclined to reveal that Ergas has been in the pay of the Federal Liberal Party, conducting Malcolm Turnbull’s own version of the Henry tax review."

Today's AFR has an item that calls Henry Ergas a prominent economist who is "the tax expert conducting the review of the country's tax system for Opposition Leader Malcolm Turnbull". Meanwhile the Australian publishes another Ergas piece, this time criticising the Rudd stimulus package, with again no reference to the relationship (however constituted) with Turnbull.

PS Until doing this review for Turnbull there is no record of him being a tax expert in any way. His CV he has been the expert on how big business should extract rents.