The connections between Crowley and inter-dimensional/extraterrestrial entities is a very fascinating subject. Actually, Crowley wasn't the only one that was deeply into the occult and had experiences with extraterrestrial/inter-dimensional beings. Hitler was said to have had an experience with one. The credibility on both accounts is somewhat questionable.

However, with this being said, I would not link it with conventional Satanism, or the Illuminati.