Yup. Like all leases, you don't fully own the property. Even if, say, you buy a flat in a tower block, with a conventional lease, you're only really buying the right to occupy the flat , with the freeholder actually owning the bricks and mortar. When your lease expires (whether that's after 9 years, 99 years, 999 years or whatever, the property will eventually revert to the freeholder).
The only difference with a lifetime lease is that the length of the lease term isn't fixed; the lease only lasts as long as you do!