The memo you're referring to makes use of internal departmental projections using a number of different scenarios if nothing was done at the IRB either with regard to efficiencies, or with regard to further funding. In these situations, civil servants develop a number of scenarios to demonstrate the cost if nothing is done, but of course something has been done. Actions have been taken subsequently, significant increases in efficiencies at the IRB and a number of different funding envelopes for the IRB, to prevent that sort of accumulation from occurring.
On March 19th, 2018. See this statement in context.