No, my dude. It's an open ended question in the sense that it purposefully asks a question about a concept which is inherently personal. That's how this goes for this kind of research.

The whole point is to let each person define what their own version of gender expression is, and answer based on that. The fact that more (or fewer) people are choosing a charitable and supportive definition of gender expression is, that's the signal being measured.

If this number goes down, it signals that people are increasingly holding definitions of "gender diversity expression" that are harder for them themselves to accept. No measurement is perfect, but they can still be useful. If this "flawed" question carried no information, we wouldn't be seeing trends on it.