I disagree. Just because it's an unpaid volunteer position doesn't mean expectations should be low. Diversity is a problem in the tech world in general, and despite recent efforts, is still one in the Linux community - regardless of distribution.
Bringing someone on board for this position who would be ineffective, unfamiliar with the duties of the role, and unable to meet the requirements listed would make the role irrelevant and hamper efforts to increase diversity and equality to the community.
By pushing such formality, it gets rid of the cruft - those who would merely use the position as a title, those who would use the position for their own gain, etc. - and sets a tone of professional understanding, putting anyone who applies on notice that there is serious efforts behind the creation of this opening.
I know it limits prospects; I am aware that it might be confusing. But anyone who is confused may not be familiar with Fedora, and that lack of understanding and knowledge would be a problem The Diversity Advisor would be working with very sensitive, sometimes hot-button issues with a wide variety of people whose sexual orientations, racial/cultural backgrounds, abilities/disabilities, self-identification, etc. must be respected and recognized in a professional manner. Fedora needs someone who can do that, and hopefully someone who has proven that as well.
My apologies for the rant - TL;DR I think the professional look and process is definitely worth it, and will lead to better candidates and a more progressive and diverse community, and could hopefully be a template for other distributions and companies as well.