UNtrue, Canadian pension plans in the public sector have to be fully funded (and have an independent audit every 3 years to show this). CPP is still developing as it is (in pension terms) relatively new but is, under present funding, sustainable for at least 75 years (again, based on independent audit). 
MP plan is not funded. 
Taxpayers cannot, by law, pay unfunded liabilities (which, anyway, are not a debt but a forward-looking projection).

As for the article that you quote, CPP changes are on a go-forward basis so have a zero-cent impact on current funding of PS pension plans.