Says right there he was a man and hid his genitals. Was even investigated by doctors and there's nothing abour him being or identifying as anything other than a cis male, other than when he seduced that diplomat.
Which is what makes it even more bizarre IMO that the French guy couldn't tell. Like how does it even go deep enough? Or we they doing exclusively anal?
Though perhaps by modern terms he'd call himself nonbinary or gender fluid. I suspect there just wasn't good widely used terminology for what he saw himself as last century.