Shouldn’t it then be the “gender pronoun census” or something like that?

no because that wouldn’t encompass the scope of the survey. it also asks about how one describes one’s own identity in english (ex. agender) and titles (like “Dr.” or “Mrs.”)

the author says they don’t call it a nonbinary survey because they want to be as inclusive as possible (so that they receive responses from anyone who qualifies instead of people thinking they don’t simply because they don’t identify as “nonbinary”)

fascinatingly, the author of the survey seems to deal with a lot of cis women objecting to the survey, because this is included in the FAQ (formatting is copied, not mine):

I’m an adult human female!

Great! If you feel like you can honestly check the required checkbox at the beginning, then you are welcome to take part and your responses are valued.

Yes, I confirm that I don’t really fit into just one of the two boxes of “always, solely and completely a woman/girl” or “always, solely and completely a man/boy”.

A lot of you describe experiences of not identifying with your bodies, feeling like you don’t have any internal experience of gender and feeling negative emotions when people treat you like a woman, etc. These are stories that are very common in this survey, and this is a place for you to voice them if you would like to. …

If you stick to describing your own feelings and experiences and avoid making sweeping judgements or insulting me, your identities and titles and pronouns will be represented in survey results. This is because a lot of gender-critical and radical feminist women seem to experience gender in a way that isn’t fully described by the restrictive gender binary, and often in a way that is very similar to nonbinary people’s experiences. (Based on their submissions to this survey over several years, anyway.)

this goes back to why “gender survey” is a good name. there may be people who consider themselves “female” (for example) but don’t feel like a “woman” at all and instead think of themselves as totally genderless. they may never call themselves or think of themselves as transgender or nonbinary but as they do not experience gender as being “completely a woman”, they would qualify for the survey. i actually know more than one person irl to whom this applies.