So because it wasn’t tested strictly with the scientific method, it’s completely invalid?
As a scientific study, yes, it would be completely invalid.
But just because something wasn’t “scientifically” conducted in a technical sense, doesn’t mean it can’t be used as a basis for the views of experts.
Yes, as a personal opinion, but you referred to those as a "study", and I am saying that a piece of nonfiction literature has to meet certain scientific standards and criteria to be referred to as a study.
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