The article linked here is a rebuttal of a Sedevacantist criticism of John Salza, already mentioned on this blog and a proposer of classical Traditionalism in SSPX style, which they call “recognise and resist”.
I have read the article in its entirety, and it seems to me both the original article and the rebuttal are worth reading; and whilst I do not doubt that the Novus Ordo Watch troops are composed of good and sincere Catholics, I find the one or other criticism levelled at them to be rather well-chosen.
The article deals mainly with the matter of Papal infallibility and the correct reading of the Conciliar documents; apart from the little and understandable blunder of calling Francis' torrential apostolic exhortation “encyclical letter”, I find the author's every sentence worthy of careful reading and agreement.
The article does not deal with the other, so to speak, missing leg of modern Sedevacantism: the impossibility to reconcile the Indefectibility of the Church with the strange theory that a fake church is now confused all over the planet and believed to be the right one; whilst only a bunch of very smart theologians and their very perceptive readers understands that the NO Church is an impostor and the real Church is a teeny weeny spot on the Catholic world radar.
One thing is to say that a Pope is, even, a formal heretic. Quite another is to say that the entire system has short-circuited 50 years ago, and is now unable to produce valid priests, deacons, bishops and yes, Popes, without any idea of how God will set things right.
The article also has useful references to past Popes, and some interesting details about the apparently factual occurrence of the “deposition” of the offending Pope by the Roman clergy and, transposed to today, some (or better: many) good Cardinals. A thorny issue, this one, but again one showing there isn't much new under the sun, and the problems we have now have been encountered in the past already.
The article is certainly is worth your time.