I thought Sungenis was a neo-Cat (those who would normally defend JPII). I’ll have to look into the links you provided.
No, he is more like a neo-sedevacantist, as a perusal of apologist/researcher James Swans's http://beggarsallreformation.blogspot.com/search/label/Robert%20Sungenis will show, with some history.
I certainly disagree and oppose many things of Catholic tradition as not being of Scripture, but do see why there is the SSPX and sedevacantist movement in the light of the contrasts btwn what obedience to the pope used to mean vs. V2.
Consistent with this, Sungenis has no problem with reinstituting stoning for formal heretics, while contending for geocentrism.