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This seems very compatible with what I just said.
> Long since debunked
I mean, the linked article says horses were introduced in the 1600s (brought by Europeans), and then spread throughout the Americas without requiring further European distribution.
> Horses evolved in the Americas around four million years ago, but by about 10,000 years ago, they had mostly disappeared from the fossil record, per the Conversation. Spanish settlers likely first brought horses back to the Americas in 1519, when Hernán Cortés arrived on the continent in Mexico. Per the new paper, Indigenous peoples then transported horses north along trade networks.
Don't forget to read the whole article!