Do you mean the "Preds brought us Technology" part, or the "Antartica has the lost civilization" part? If the latter, it is not BS. Not provable yet, but there has been a lot of academic work and theorizing about Antartica being positioned differently and having a lost civilization akin to Atlantis. There is evidence of another lost civilization in Asia also.
But if you mean the former, yes, BS. That sort of implication really demeans what we have accomplished as humans by ourselves.
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I'm gessing from your confusen that that you haven't heared of Chariots of the Gods before, but yes it puts forth the theory that an alien civlization infuenced on human kind.
the idea has become a main stay in Sci-fi.
Beast wars, stargate, Halo are key examples of Chariots of the Gods infuence.