In Vancouver and Toronto, but not Montreal
I assume that "construction cost" includes not just labour and materials but also developer profits, municipal fees, loan interest, etc.?
It would be nice to see recent data as well, given how high the cost of labour and materials have become since the pandemic.
If I could make a suggestion, I think you might have a better time reaching readers if you took the time to use the full titles at least once in everything your write instead of just assuming readers know what your acronyms mean. I get that CMHC means "Canadian Mortgage and Housing Corporation". I had to look up HPI, which I assume means "Home Price Index", and I did find a Wikipedia article about it.
Like a lot of real estate terms, according to Wikipedia HPI can mean different things in different countries, and, there also seem to be more than one (ie: 'new' versus 'resale'). I get that you are trying to be brief in order to not lose readership, but there's also an issue of readers not being able to understand what you are talking about.
I wonder if this is a key problem with the housing crisis. The Devil really is in the details, and the average person hasn't got a clue about what's really driving the problem because very few people are trying to explain things to them in a way that they can understand.
Housing is an extremely emotional subject to people that are getting brutalized by the current situation. This makes them vulnerable to populists who are willing sell them a convenient narrative that says, for example, that the whole problem comes down to the greed of developers and apartment owners. If no one is bothering to explain things to them in ways that they can actually understand, it leaves a vacuum for the purveyors of nonsensical public policy.
Just a suggestion. Not knowing exactly who your target audience is, or, where you are coming from---take these ideas or leave them as makes sense to you---.