I think they're reading a lot into a small survey, there... You could make a similar argument about men based on the Kinsey Report, but it's now considered fairly flawed.
Yeah, I think a lot of the ideas around women being more sexually fluid are hard to separate from societal pressures. Or, I think the ways men are expected to behave romantically is a big reason why we have the term "MSM" [1].
There is some scientific truth to it: https://www.bbc.com/news/health-34744903