I think thats a misconception. Oil is Oil. And Coconut oil does release Bile. I cant dig in, but I beleive some ppl in this forum have tried a Liver-Flush with Coconut Oil and seen results.
Also Almond Oil has been used by some. I also read a post about Pumpkin Oil.
As for myself, so far have only tried Olive Oil. Its bearable so far.