From the perspective of new post-segwit nodes, the witness data is part of the transaction data. It is serialized in a new field, after all the transaction outputs, before the locktime field.
However, this field is stripped out before relaying to old pre-segwit nodes. So from the perspective of those old nodes, the witness data isn't just external - it just doesn't exist. They don't care about the witness data, as to them, these outputs are the equivalent of "True": anyone can spend them without any signatures.
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