What makes you think the paper was not peer reviewed? This is from the paper: >Acknowledgements I thank the referees for their comments; the InSpire team for

What makes you think the paper was not peer reviewed? This is from the paper: >Acknowledgements I thank the referees for their comments; the InSpire team for clarifications; Guy Madison for discussions and suggestions; Riccardo Torre for (among many things) having implemented the WGND name-gender association; Sabine Hossenfelder for having independently replicated the results in fig. 8b and section 3.1 using arXiv data [Hossenfelder et al.(2018)]; more colleagues who prefer not to mentioned. I like the last sentence in particular and I'm not surprised :)