Credit agencies have decided long-term economic stability is essential to bond-holders receiving their principal back. That is, they believe tax-revenue growth over the next 30 years outweighs current spending to get through this black-swan event. As such, they're encouraging spending to protect the governments long-term revenue stream.
So, very large amounts of money available to government today was 1) not really the Ontario or Canadian government decision, 2) not available normally, and 3) will impede future borrowing during good economic times until our debt/GDP balance gets back down a bit.