A economist at a university in California, versus a letter from 40 economists, two of whom were presidents of the economics association here in Canada, who say literally the weight of the evidence is exactly the opposite as you're claiming.
But the economist in question undertook a metastudy of all available previous studies. The left leaning economists who signed that letter just gave their own opinion - without studies. The person quoted in the story, Lars Ogden, is from the Broadbent Institute. The only other one named, Craig Riddell, is associated with the Institute for Public Policy, established by Pierre Trudeau. Both are notably Left leaning institutions.