While the article stated that the statement was FALSE, It's actually NOT FALSE.

There was no housing minister in Harper’s cabinet at the time. Many housing issues got rolled into Poilievre’s domain under the title of social development. The six houses number stems from non-profit housing built by the government in the 2015-16 fiscal year, when Poiliever had the file. Under Harper, Canada had less social housing per capita than many other countries.

Housing was under PP's portfolio, and PP made it very small.