It makes sense. I'm interpreting this as simply using your end of year amount in savings to set your budget for the following year.
Meaning: 4% of your funds can vary year over year, so set your budget accordingly.
Side note, shouldn't you include CPP in that budget?
It's simpler in my mind: corps get local tax incentives for their footprint. EG they run a calculation on how their foot traffic impacts the local economy and take a tax break based on the "value" of "their" employees to the local businesses.
If they go to wfh/ hybrid, their foot traffic drops and the tax bill goes up.