First of all, no, it isn’t. Like, textually isn’t.

Then explain the “Liberals” part of the meme.

The problem isn’t lack of housing, it’s using housing as commodities. If you can create a system that can build millions of shitty crumbling concrete gravestones, you’d better use fraction of this system’s power to make laws that prevent commodification of housing, so it becomes affordable, and this will be the better outcome.

I agree

The premise of the meme is that the problem of affordable housing could be very easily solved if the western world was willing to acknowledge that sometimes socialists have good ideas.

This would not necessarily solve the problem of affordable quality housing, but it would be a very effective step in the right direction.

No one said they were being used by choice. The very reason behind their original purpose was precisely because people didn’t have anywhere else to live, not because they thought people would genuinely choose to live there over a normal home.

The exact context in which the word “quality” was used, since you seem to have glossed over it was:

they were made with enough quality that they are still used today

No one said that these are high quality homes. They said that the caliber of build was strong enough to still be inhabitable 80ish years later.