To be charitable, I think the point he was trying to make is that foreign students are lucrative for Canada as future citizens and taxpayers. I don't think he meant they were lucrative as tuition-payers.
Except that evidence suggests otherwise.
Lets be clear, attracting and retaining some of the best and brighest the world has to offer to our highest quality University programs is absolutely worthwhile and does pay off.
But that is an inconsequentially small part of what's going on.
Luring students, who are often not proficient in English to study in mostly second-tier programs (Community College) and non-tier programs (diploma mills/career colleges etc.) is not a win.
It clearly has the effect of exacerbating a housing crisis; diverting too much investment into real estate and financial services in Canada, lowering entry-level wages, suppressing some middle-income wage growth, and delaying investments in
productivity by business that would be driven by labour shortages and a premium cost to labour.
Meanwhile retaining 'students' who often don't complete their programs, who complete programs that aren't very useful or high-skill is hardly a great win either.
While, also managing to inflict serious financial damage to low income people from developing nations, largely with a false promise of a standard of living here they are unlikely to ever achieve.
I'd call that, lose-lose.