Also, it's a third of SOCIAL SCIENCE students, not overall student population, and the study has a terrible response rate of 7.5% which they themselves admit in part 4.1. Also, because it seems like bad faith editorializing by the OP, it's about banning books from the university library, not in general.
In other words, the study is awful and it doesn't prove any point, but because it's easy to spin it into an anti-woke censorship narrative, HN is going to eat this up.