They're not very left-wing by objective standards, or compared to their roots, but by modern, Overton-window-has-shifted-to-the-right standards they're left-wing.

But there's a grain of truth in what the parent is saying: if you cost out the platforms of Jagmeet Singh or Andrea Horwath from the last elections, you'll find they're less economically liberal than Brian Mulroney or Mike Harris.