He's a geocentrist. That directly undermines his credibility on Scripture, papal teaching about Scripture, and the weight of various papal acts, and indirectly on other theological matters.
I hold absolutely no brief for Fr. Joseph Pfeiffer, but your quip about his being a geocentrist undermining "his credibility on Scripture, papal teaching about Scripture, and the weight of various papal acts, and indirectly on other theological matters" appears to be a quick gratuitous attack on geocentrism. Are you implying that a belief in geocentrism is inconsonant with the Catholic Faith? If so please be so kind as to explain how it is.