No. The SSPXers are far more Catholic, from the exterior point of view, than the "conservative" NOers.
It seems to me that they are doing what they believe to be right.
If I may add my five cents (inflation!) here for a moment:
The question, "Who is more Catholic? The SSPXer or the conservative Novus Ordo?", is a most curious one, and difficult to answer properly. Let me illustrate:
(1) The conservative Novus Ordo adherent is right (and therefore more Catholic) in his acceptance of the principles regarding the Magisterium, the papacy, and the Church's teaching and ruling authority. He adheres to the same principles in this regard as the sedevacantist does. But because he is mistaken about the identity of the Pope and the Church, i.e., because he is wrong about who the Pope is and where the Church is, and instead accepts a heretic for the Pope and a heretical body for the Magisterium, he is therefore drawn into heresy and other error. Hence, though he is right about the authority of the Pope and Church, he is wrong about who these are, and thereby falls into grievous error and heresy. For him, it's (the false) Pope first, then the Faith.
(2) The SSPX adherent is right in his acceptance of the content of the Faith, in almost all parts. He adheres, basically, to the Faith taught before the death of Pope Pius XII, but because he, like the Novus Ordo, is mistaken about the identify of the Pope and the hierarchy, he realizes that there is a disconnect between the (in his mind) true Pope and hierarchy and the Faith of the Ages. He "solves" this problem by modifying some Church doctrines and dogmas (authority of the Magisterium, papal primacy/jurisdiction, etc.), which in practice really means that he simply IGNORES the "Pope" and the "Church" whenever he thinks it necessary to safeguard his faith. For him, it's the Faith first (sort of), then the (false) Pope.
Neither position is truly Catholic. The error in both is that the Pope is no longer connected to the True Faith - an impossibility. (Vatican I declared that the Holy See cannot fail, and that true doctrine is always celebrated there.) One decides to give up the Faith for the Pope, whereas the other decides to give up the Pope for the Faith.
Only the sedevacantist escapes the dilemma: By recognizing that there can be no Pope who does not have the Faith, nor the Faith without submission to the Pope, he must necessarily conclude that, in order to keep the Faith intact, the only possible solution is that the men who have claimed to be Catholic Popes since 1958, cannot have been true Popes, and the entire church they led, cannot be the Catholic Church.
This, ladies and gentlemen, is the whole story in a nutshell.