Twofold:
1. Property tax. Virtually every place in the country charges property tax; if you stop paying them, you lose your house. So do you own it, or are you renting it?
2. Eminent Domain. Even when you aren't running into this problem, they can buy your house from you at any time, usually for going rate for the area, and you can't say no. Even though they have to pay, when you don't choose whether or not to sell something, do you really own it?
(Both of these apply to commercial and industrial property, too).
Ugh. No.
This is the philosophical equivalent of saying that every person in the United States is "owned" by the government, because they can imprison you (if they follow due process) and they can tax you.
Private ownership of property is a fundamental right. The government does not, in fact, own your property- this is a major distinction, given that there are, in fact, countries where the government owns all property. The idea that the government has some legal authority to buy your land for a public purpose, so long as you are afforded due process and you are paid the fair market value of the land, does not mean that you do not own the land; any more than the fact that someone can sue you and "get" your land because of defect of title.
And the idea that you don't own something because you might have to pay taxes on it is ... well, you are certainly welcome to that belief. Of course, the immediate issue with that is that not all land is taxed.
Anyway, given that real property interests in the United States are divisible, descendible, and alienable, for a person to say that the government "owns" all the land says more about the person saying it than it does about reality. You can't re-define common terms in order to make points.
ETA- anyway, the other posters in the thread have identified the real problem. Dracs. That's right, we have to keep our jobs safe not from the AIs, but but from the Dracs. They don't drink ... wine.
