[barry27]

Exactly. They say this in the study:

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Our empirical analysis is based on original survey data collected from social science students at Goethe University Frankfurt. We are certainly not under the im- pression that our sample is representative of university students in general (or the wider public, for that matter). On the contrary, we purposefully consider the social science studentship at Frankfurt as a most likely case (George and Bennett 2005; Gerring 2007)

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..a fact that was obviously overlooked by the outraged masses on Twitter.