"Hydrogenation": as we all know, oil is a liquid that can't be made into shaped chocolates, so it has to be "hydrogenated" so that the unsaturated fats in the oil turn into saturated fats, and then the oil slowly becomes solid.
"Trans fats (acid)": trans fats are intermediate products produced in the process of hydrogenation of vegetable oils, belonging to the fats that are not fully hydrogenated, the English is trans fats, meaning that the fat in the transformation, this kind of fat is not the fat that exists in the natural world (unnatural fats). So eating it will have an adverse effect on health, mainly increase cholesterol, cardiovascular and cerebrovascular unfavorable, easy to cause atherosclerosis, hypertension and so on.
Why is cocoa butter bad: Vegetable oil is free of trans fats, and fully hydrogenated saturated fats are also free of trans fats. But vegetable oils are liquids that can't be used in chocolate or for shortening. Fully hydrogenated saturated fats are hard, similar to wax, and have a very bad taste. So neither can be used to make chocolate. So chocolate makers use partially hydrogenated vegetable oils to make chocolate. However, partially hydrogenated vegetable oils have the highest content of trans fatty acids. So it's not really the cocoa butter that's bad, it's the partially hydrogenated fats (acids) that are bad.
To summarize: you should now know why Delfis must be stored refrigerated! Because his cocoa butter substitute is actually a non-hydrogenated vegetable oil, which is to say, an oil! It's liquid at room temperature! Due to the mixing of cocoa butter and some other ingredients, it becomes thicker, so it comes to be shaped when refrigerated. This is similar to the familiar "meat jelly", a stewed meat broth that takes on a shape when frozen, except that the jelly is made from animal oils and the chocolate is made from vegetable oils (and, of course, with different condiments).
Conclusion: Non-hydrogenated vegetable oils are completely harmless, and are the same as the high-end vegetable oils we usually promote, such as olive oil!