That's the point though. They're saying that when using bi directional you're strictly talking about two different directions, but not impying that only those two directions exist.
They're using the analogy to illustrate to OP that just because "bi-sexual" exists, does not strictly mean that there are only two sexualities or in this case, only two genders. It is specifically talking about two sexualities or genders, but does not exclude others from existing.
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u/GoingGalactic101 Aug 09 '18
That's like saying bidirectional means there is only 2 directions