No. Some pathologists study tissue from tumors, for example, to classify the type and the chance of malignancy. When you get tissue samples, that is who studies it. They can establish both infectious and non-infectious pathologies via fluid or tissue samples. Some of them specialize in autopsy, or necropsy.
If this chap was fluent in the study of infection in tissues or fluid via bacterial/viral/fungal orientations, he would certainly have a leg to stand on and a valid opinion. But he doesn’t, so there it is.
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