Just as a personal comment, he is a lucky man. He doesn't have to do the election platform costing in Ontario. It's the Auditor General in Ontario who is essentially calculating a baseline at the beginning and end and then providing that to the various parties. That is exactly what it is in Quebec also, where an election is coming. The Auditor General provides baselines such as macroeconomic projections, which parties can use for their own calculations.
On May 24th, 2018. See this statement in context.