I looked through the plant butters listed on that website. Some of them are indeed made of coconut oil, but also blended in with some other vegetable oils. I guess the blend gives it a more butter-like flavour and texture.

There are also some that are made with unsaturated fats only. Those ones look questionable to me. But then again, I’m no chemist. Maybe the other non-fat ingredients are responsible for keeping it solid.