There is no merit to this myth. There was no other worldly perception of the Spanish, nor were they doing anything that would warrant that perception.
What did the Spaniards bring to the continent? “Armor, crossbows, harquebuses, certainly—but also horses [..]” along with disease, rape and an odd mix of genetics from past colonization done unto them from Arab Moors.
A new article on JSTOR News reviews these bogus claims and debunks them.
See it here: Link To Story.