No, the title is not a mistake. These two vases are made from brown oak, which is essentially normal oak that has been infested by a particular fungus causing the dark brown colour. They were turned from green wood (i.e. the wood has not been dried at all), and then only finished with some sanding sealer.
Believe it or not, these two were at some point perfectly round and perfectly straight. The drying process causes the wood to warp in unpredictable directions, as the different density of heartwood and sapwood, and also the various burrs in these vases, release their stress. The shape is probably not finished, and any changes in humidity will cause further changes in shape. In other words, a piece of living art.