Thanks for mentioning a possible bug! I looked over the page to check and get it fixed, but it looks like Eddie and Dana are listed in the Table of Contents, but under "Internal Personas" (assuming you meant they weren't listed in the User Personas list in the beginning): https://about.gitlab.com/handbook/product/personas/#internal...
I actually didn't know about https://thispersondoesnotexist.com/, that's kinda neat!