I mean it makes sense. Feminism has become quite the loaded term as of recent, and young people are going to be a lot more distanced from the earlier wages of feminism.
That’s what I’d assume. My impression is that many Gen-Z might associate the term “Feminism” with J.K. Rowling and such, Trans-Exclusionary feminists as it were. If there were questions that could suss out concern about trans issues, or even LGBT+ issues in general, I suspect the differences between generation might match.
Not even getting into substantive issues, the people who loudly proclaim their feminism online are usually total fucking jackasses since honest people see little need to hide behind the concept of “feminism”, as if it’s a shield against criticism.
Overall, a more substantive survey would just be better. Or really anything beyond “self ID with a broad and contentious label”.