The Parliamentary Budget Office is independent and nonpartisan. It's literally their job to provide cost estimates for parliamentary proposals. They're designed to hold the governing party accountable for the financial implications of proposed legislation.

It's perhaps also worth noting that with 38 million Canadians, you're talking about roughly $2 per person. I don't think that's a meaningful amount of money at the national level. Government spending on healthcare is roughly $8000 per person.