Do you take the argument to be that there is a single owner of housing to which everyone pays rent then? The reasons why that would be worse should be plainly obvious.

No. There is no single owner. Whoever wants to own their property, can buy/build one, there are enough of these for sale. I don't know of any case where municipality building houses (or another infrastructure like broadband) would make the situation worse for everyone.

So you meant we keep the current system but have expanded public housing? That’s not really decommodified though which is the original quote.

You sounded like you are completely against any form of communal/public housing.