Shia Islamic Argument for the existence of God

[quip]

"The point towards which ‛Allāmah Tabātabā’ī draws attention is that the proposition “There is a reality,” and the proposition “Sophistry is void,” have eternal necessity.  That is, the modality of these propositions is not attributive, conditional, or essential necessity.  Acceptance of this claim, like acceptance of reality, needs mere drawing of one’s attention (tanbīh).  In other words, just as the entertainment of the concept of reality is sufficient to acknowledge its truth, the conception of the notion of eternal necessity of reality is sufficient for accepting its validity. A human being cannot accept sophistry in any situation or condition, since situations and conditions are realities, which attest to the invalidity of sophistry, which is the negation of reality.

This smacks of presuppositionalism. That is...it begs it's own validity, which in turn is a "negation of reality" thus remains valid....ad nauseam.