Here's what seems like a major contributor:
With these sources:
Secrets of the Druids by John Matthews
Magic of the Celtic Otherworld: Irish History, Lore and Rituals by Steve Blamires
Celtic Myth and Religion: A Study of Traditional Belief by Sharon Paice Macleod
http://loki.stockton.edu/~kinsellt/litresources/celts/review/supernatural.html
Some the things in the post seem to be from the book "Celtic Smiths and Satirists: Partners in Sorcery" by M. Randolph
Although I think the "they weren't allow to marry" was more that they became hated for abusing their power, so it was more likely a "they shouldn't be allowed to be happy" type of deal. But I didn't read enough to check that out fully.
That’s interesting. I do want to know what their source is though.
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