Enochian magick is way too complex a system to just whittle it down to whether the angels are legit or not just because they have weird names.
Not every angel has an name that ends in EL, or IAH, or ON (which actually have significance in Kabbalah, especially in Hebrew, by the way).
Brand says right in the book that you might not notice anything immediately, and that the effect of Ritual 1 might not even show up until months later. He says to just do the ritual for seven days, and to remain open to cues through introspection, and daydreaming. The ritual’s purpose is to give you direction to a dream, a vision of the kind of success right for you, and its effect can be extremely subtle and easy to overlook.
Stop expecting flashes of lightning and sensations of presence, and just do the ritual as instructed with a sense of wonder and allow it to move in your life as it will.