Oh really? Cause I'd love to see your evidence, definitions, working process and all the things that have led you to believe you can figure out someone else's gender just by reading an article about them without them stating it.
You know, I'm saying this because I'm giving you the benefit of the doubt. If you're about to come out with some essentialist shit about genitalia or sex characteristics then, please, for the love of all that is good, go and read some more about what gender is and what sex is. Neither of us have time for that shit.