Not that anyone's going to care, but I found an archive for the original cookiegender page and now I know who coined it! :))))
Here's the archive btw: https://web.archive.org/web/20220120145925/https://lgbta.fandom.com/wiki/Cookiegender
And here's an archive of the LGBTA wiki right before it was deleted:
https://web.archive.org/web/20220215001012/https://lgbta.fandom.com/wiki/LGBTA_Wiki