Caminus strikes me as a very bright guy so if he doesn't see the infiltration then, as I see it, he's deliberately ignoring it.
All the clues point in only one direction.
If we are to accept the novus ordo, then we are to accept that the three major world religions worship the same god. This is a contradiction that can't be overcome. I didn't say someone couldn't put forward silly arguments designed to trick the ignorant (I am specifically referring to Fr. hαɾɾιson's "faulty TV antenna" analogy).
If we are to accept the new church, under the aspirations that a small group like the SSPX is going to act as a decontaminant, well, that is a form of positive thinking that is clearly vainglorious.
If we are to follow Our Lord, then we can't follow those who either outright negate Our Lord or add their own words to Him and claim them as His.