Yeah ridiculous wording.
A male is going to have to try really hard if they're desperate to appear female while cycling. Your attire needs to be at least somewhat functional. You tend to view cyclists from behind so body shape and size is obvious, but lippy, for example, isn't.
But as a London cyclist the findings don't surprise me at all. Not just aggressive drivers - I've been swerved at by a big van full of laughing men - but also entitled male cyclists who will not allow women to pass them even if they're cycling faster.