The article states that 70% of those occupying social housing have their rent payed for by housing benefit. The article also mentions that housing benefit comes from central government.
So the effect of this is a transfer of more money from central government to councils and housing associations. As well as an increase in the incomes of councils and HAs from those 30% that are well-off enough to no longer receive housing benefit but are still living in social housing.
Inverse of the classic: