The two words "can be" was just my grammatical method of stating that a theory that can be tested can be deemed to be a scientific theory, and thereby implying that a theory that cannot be tested cannot be deemed to be a scientific theory.
Homer Kelley's TGM theories regarding the golf swing are testable, and have been tested. In fact, he probably spent endless hours testing his theories, and he probably then used his test results to refine his theories. In that sense, he was quintessentially a scientist working according to the fundamental tenets of "good scientific practice". By contrast, most golf instructors have "opinions" that are not even coherent enough from a cognitive perspective to represent a testable theory.
I regard the term "thesis" and 'theory' to be interchangeable.
I also don't like using the term "centrifugal", but that doesn't automatically disqualify Homer Kelley's golf swing theories. That's only one "word" used to express a concept, which is still conceptually relevant!
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