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The reviewers are cited as part of the publication:

Binsila B. Krishnan, National Institute of Animal Nutrition and Physiology (ICAR), India

Jingbo Dai, Northwestern Medicine, United States

From a quick Google, they appear to be real people.

Frontiers has an explicit rule against that, although I doubt any reviewer would admit to it.

Perhaps the reviewer was an AI. Which gives a new spin to 'peer review'.

makes sense, because the peer of AI can only be AI