It depends on the local definitions. You know the situation in Quebec very well: there are two definitions, one based on people's income and another based on the median rent in the community. It will depend on the cities where these housing projects are developed, as well as the projects submitted. It will also depend on additional support from the Canadian government.
Indeed, it is a very good thing to make land available free of charge, in the very long term, to businesses and non-profit partners, such as housing co-operatives, cities and others. It reduces the cost of land use. Sometimes, however, these partners need additional assistance. That's especially the case for building more deeply affordable housing, particularly social housing, in an environmentally smart way. These units must also be close to public transit and meet appropriate accessibility standards. So that requires additional budgets.