Galide, I am afraid you missed it a little bit here.
I think you took Dave's statement too much personal for some reason and further act unnecessarily in a slightly emotional way.

As deepsand rightly says "It's been a while since first having learned of the various fallacies and their names", but IMO it cannot be the correct argument in a non-related discussion or SEO topic.

Let me say that NOTHING is provable, but the perception of the most "steady" parameters is actually product of one's understanding and personal experiences. In the same way one can perceive some statement as true, false or if you like, sophism or anything else.
SEO business is sophism itself and for many it means selling hot air, but for some others it means an incredible help, depending on how much money it brings in.

Most of us here speak out of pure experience and it's no wonder that you hear diametrically different statements. It is very helpful to hear as many as possible opinions in order to either make our own as a starting point or to possibly adjust already built up values.

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