You are appealing to authority. They are right in the sense that the owning class will try to maintain their position. Now, what do you want to do? Stage a revolution without weapons from the means of production?
Hegel for sure is proud to know that those two reached the end of philosophy.
I don’t question that communism and Socialism can create better housing. My point is that as long as you are in capitalism, you have to play by capitalist rules. This means you should increase competition. It’s not the fault of landlords that there is not enough opportunity to build affordable housing.
Blaming landlords is counter-productive because renters don’t feel the need to build the power to influence the next election.