[Goladus]

In this case, the distinction is unlikely to be relevant. The subjects are "women" (unqualified) and the audience is everyone.

If a woman whose gender and sex don't match is interested in being a subject on the site, then the distinction might be relevant. Judging by the tone of the site, they seem likely to be inclusive more than exclusive so long as your story is worth covering. But that's hard to say for sure and certainly use of the term "gender" (unqualified) doesn't tell us anything.

Although a person with male genitalia who looks like a man and acts like a man but claims to identify as female may be denied coverage, the odds of this scenario happening are very low, so the distinction between sex and gender is a non-issue in this case unless you have a particular agenda to push.