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I'm, ahem, a bit out of my depth here, but this reads to me like a lossless translation from an original language which inherently expressed the gender. They've done the same thing with "the female dolphin".

There is good evidence that dolphins can see inside other mammals with their sonar and determine if there is a pregnancy. They can get information about your innards.

Occam's Razor suggests old-fashioned sexism

I don't follow. How does sexism explain this?

translation of uselessly gendered pronouns where no neuter exists (as mentioned in another comment) is explained by unawareness to the source language's imprinted sexism.