Yep, it's a valid criticism of Thatcher. She flogged off loads of social housing at large discounts, let the tenants keep the profit, never allowed councils to use the cash to replace the houses.
Today's housing shortage (especially in social housing) is largely a result of that policy.
This put up rents, which forced up housing benefit to chase the increasing rents. This dictated the price of entry level houses -investment landlords would set the price of the houses based upon a level of rent that the government would guarantee.
Thus people on average wage couldn't get on the ladder, they were priced out of the market by the level of housing benefit the government would pay. Normally these people would be in council houses and not competing - or costing the taxpayer huge amounts of cash to house.
And now the taxpayer is on the hook for private sector rents.
Good intentions perhaps, but a complete disaster 30 years later.
Thatcher got some things wrong.