The quote refers to Psalm 108, which is the Holy Ghost's words in the mouth of Christ against his persecutors, especially Judas.
So even Psalm 108 is talking about Judas. That's the interpretation of the Catholic Church, so that's what it means. Period.
If he had a bishopric, then he was a bishop. Even though he didn't have the Faith. It certainly seems to suggest sedeprivationism.
But also remember that they didn't replace Judas until he was dead. If he had remained alive for another 3 years, would his "place" have been held in the college of the Twelve Apostles? I think it would have.
So this is an argument AGAINST sedevacantism. If he simply "wasn't bishop" they could have replaced him at any time. That's why I often say that the only honest sedevacantists are of the conclavist variety. If you REALLY think he's not the pope, then why do you act as if Pope Francis deserves to sit there for a while? Do you think his "place" should be held until he converts or something? That's the definition of Sedeprivationism.
I don't think many Sedevacantists act as if we're living in an interregnum (time between popes). If they did, they would certainly want to fill that horrible void in the Church hierarchy. After all, it's Catholic dogma that the Catholic Church needs a Pope as her head, to be the vicar of Christ!
In fact, in my opinion a sedevacantist who isn't "conclavist" is holding the same position as the "Recognize and Resist" Catholics they make fun of so much, deriding them as "illogical" and "fence-sitters". What's the difference? Neither one follows the Pope, and neither one acts like Pope Francis doesn't hold the Office.
Note: That's not an insult, because I am recognize-and-resist myself. But I am criticizing their lack of honesty, and their tendency to attack myself (and others like me) for behaving almost EXACTLY as they do.