Don't know about the "lubricant and cleanser", but it has two relevant scientifically verifiable properties: 1. It's fat, which helps get fat soluble vitamins

Don't know about the "lubricant and cleanser", but it has two relevant scientifically verifiable properties: 1. It's fat, which helps get fat soluble vitamins (if you take them while fasting) digested and metabolized. 2. Butter at least (likely ghee too, but I'm not sure) is full of butyrate, the metabolites of which are heavily involved in ketosis in humans (and is hypothesized to promote ketosis, though I don't know if that was conclusively demonstrated)