Uh, what are you trying to prove? My understanding is that Fatima.org is a pro-SSPX site, and if you are look, there are articles defending the SSPX. When this author is talking about Sedevacantists, he's not talking about the SSPX.
If Pope Benedict XVI allows for the wider use of the Tridentine Mass and the use of Latin, the SSPX would become even more fictionalized in itself, and there would be many who would come back into communion with Rome, leaving the remainder of the SSPX as delusional schismatics who won't be pleased with anything but the complete reversal of Vatican II, and then some.
I do sympathize with many of the ends that the SSPX wants, but I am very much against the means in which they communicate with the Vatican. They are always on the attack, many of their articles are against individuals who THEY view as being wrong, such as Pope JPII & Pope B16, and are very angry and spiteful people in how they communicate. It's either their way or the highway.
I would love to go to the traditional Masses each Sunday, and to do it in Latin, that was what made the Catholic Church so great, and is a huge part of her identity, tradition, and universal nature. I would not break communion with Rome to do so. By definition, if you were in communion with Rome, and by your words or actions are no longer in communion with Rome, either willingly or unwillingly, you are a heretic. I don't like it, but thats how I see it.