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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.

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

Higher acceptance rate, but more reviewers per paper.

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