Right but it sounded like he's talking about the dream regarding the entity and not necessarily trying to argue the magic worked in the dream, but more that the sigil worked to help him LD.

Entities can be helpful for ritual though. We're conditioned into believing on an unconscious level that we're powerless, or at least that our power to create the reality we want is very limited. We're also conditioned to associate words like God with immense power, as well as terms like Guardian Angel. The unconscious mind does not care whether or not you believe guardian angels or God exists, because it only see's through association and doesn't have a sense of true and false. It only has a sense of strong relationships and weak relationships, as our neural connections can be strong or weak. Therefore, using a totem such as a guardian angel, god, Satan or anything else which your cultural background gives power to, can be extremely helpful even if you consciously remember they don't actually exist outside yourself. They are totems with which the trick your unconscious into utilizing it's full potential despite the fact that it does not associate your individual self with that potential.