That's only true if you refuse to separate the concept of ownership from the contract that assigns it. As I see it, it's none of my concern how you came to own that TV -- what matters is that you own it now. The TV is not a bitcoin that needs to prove its lineage to everyone who comes across it, and the sales contract is not a passport that you need to carry around to prove you own the TV. A third party can't ignore the contract and pretend you don't own the TV any more than he can ignore a contract with your barber and pretend your hair hasn't been cut.
I refuse to separate them because you can't separate them. It seems like you can when you look only at simple sale contracts. If I sell you the TV, you now own the TV. It doesn't matter what the contract says. But we're not talking about simple sale contracts, we're talking about more complex cases. Say you buy a TV, but in the sale contract you agreed not to watch the TV on Wednesdays. Now suppose I accidentally destroy that TV. Are you entitled to the fair market value of the TV? No, because the fair market value includes the value of the right to watch the TV on Wednesdays, a right you didn't have.