I prefer not to even say I am a "believer", there is something called first hand experience, knowing and then of course just good old observation.
Isn't that just anecdotal evidence, which is notoriously unscientific?
Yup, especially from someone who wants to believe.
He already has his conclusion and then does his study to confirm this conclusion.
Right. The fact that "knowing" comes before "observation" in his post suggests confirmation bias, as well.