>This is a legitimate publishing company.

Just because the publishing company is legitimate doesn't inform on the legitimacy of the study.

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>His past posts have nothing to do with the validity or lack there of regarding this current article.

No but it informs what kind of things they will post. We wont see any positive studies, and only those that are negative. They are also more likely to post flawed studies. So you should look at any studies posted by them with extreme skepticism.