I don't think you read the parent comment properly.
Of course it was "an experiment" but that doesn't mean you can automatically draw useful or even valid conclusions from it. If I ate nothing but peas for a day, my "experiment" wouldn't say much (if anything) about the effects of a pea-only diet on the human body, but if I did it for a year, I might get some useful data. Except that would still only be the effects of peas on my body, and may not generalise to other humans anyway.
Of course it was "an experiment" but that doesn't mean you can automatically draw useful or even valid conclusions from it. If I ate nothing but peas for a day, my "experiment" wouldn't say much (if anything) about the effects of a pea-only diet on the human body, but if I did it for a year, I might get some useful data. Except that would still only be the effects of peas on my body, and may not generalise to other humans anyway.