Actually, Nocturnal witchcraft does take certain elements of traditional witchcraft ( i mean it's called witchcraft ) however, from my understanding, since i've read most of his works, he talks about not only attuning to night, but to attuning to the Gods and Goddesses of the dark, many deities of which many Wiccans don't think to take a second glance at.
and although he talks about the spiritual practice of witchcraft, he writes from a completely occult and scientific point of view. His techniques for astral projection and his meditation exercises, such as the "quiet mind" are entirely unique.
I certainly recommend looking in to Nocturnal Witchcraft. It's taught me much more about the craft than most other works, and the occult perspective provides a fresh new take on how you look at the powers after dark.