I think if the ritual was genuine it had nothing really to do with Shiva or Ancient Indian traditions. More likely to be some kind of modern occult appropriation

That could be true. Wouldn't be the first time. Another example: Theosophy (and the ensuing New Age Movement) is built on concepts from Yoga, Buddhism etc. but its beliefs have nothing to do with these. Rather Blavatsky was a Luciferian.

As someone who is familiar with the Indian version, the whole new age movement gives me a dark vibe. In the name of spirituality, they're actually undermining the moral framework of society from something shared to something individualistic. The implication is that there is no common understanding of right and wrong shared by the majority anymore (no unity), leading to a widening of the moral Overton window (because who is to say what's wrong), an attitude which will lead to degeneracy, and ultimately civilizational instability.