The National Housing Federation represents the interest of all the Housing Associations.
So, not-for-profit or not, they have a vested interest in self-existence. They are just people with jobs to protect too, you know.
What the article is actually about is overcrowding.
This doesn't fit too well with Government policy that requires a greater proportion of smaller houses to be built, and to a density per acre far greater than in recent past (since Victorian back-to-backs).