Did you read the article.  After years of fears of more rent controls, developers haeve decided it is safe to start building purpose-build rental units again (see CMHC Rental Market Survey) but my guess is that these buildings will now be registered as condominiums but the cost of rent controls isn't worth the risk.
The real rental market is now condominiums because landlords can get out of the business if the government once again imposes rent controls.
Try studying some economics.