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Are you sure it was peer reviewed at all? It looks like a conference proceedings.

According to this https://iopscience.iop.org/article/10.1088/1742-6596/1943/1/... they're all peer-reviewed. An average number of reviews per paper of 1 seem a bit curious though.

Assuming that every paper is reviewed at least once, Markov’s inequality implies that every paper is reviewed exactly once!

I think this is the declaration for the volume containing the conference in question?

Higher acceptance rate, but more reviewers per paper.