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No, it's not bullshit. Those celts came into iberia. Iberian, the language, is not considered IE. Neither is tartessian, nor is basque. The only people who consider them to be IE are those who consider them to be pre-celtic.
I did not mention that possibility because obviously if that is the case then the actual IE homeland is Iberia. Which may well be true, but is far from certain.
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