Let's talk about the Fraser Institute's use of selective data.
For a taxpayer making $90,000/year (a good middle class income), the tax savings instituted by the Liberals resulted in a reduction of income taxes of $675 for that one individual.  The author points out that CPP contribution went up 2%.  Wrong!  A 2% increase in CPP contributions is not a 2% tax increase.
For that same taxpayer making $90,000/year, the increase in CPP contributions from 2016 to 2017 was $20, yes, $20.  
So how does an income tax savings of $675 for middle income taxpayers equate to an extra CPP contribution of $20.  
These authors are not being truthful and the headline to the article is false.