The He/She angle reads like the author started with an idea and just filled in the blanks to a story that is a bit of a nothing burger. A grad student discovering something in their supervisor's lab does not get the recognition for it. While you can absolutely think that it's an issue, but it has little to do with sexism in this case.
Burnell brushed this off herself during an after-dinner speech[1]. Title and description aside, the video is a decent watch.