Why do you think this is a relevant critique to the article/paper? The study is about a global trend in increasing appendage size within populations due to warm

Why do you think this is a relevant critique to the article/paper? The study is about a global trend in increasing appendage size within populations due to warming ("Allen's rule"), not whole body size ("Bergmann's rule"). Secondly, the role of food is acknowledged as a potential factor in the section on causality, but justifiably rejected as the sole factor.