He's naive to think sedevacantists would respond to "talks" with Rome because sedevacantists don't trust "Rome" as far as they can throw them.
We would all have to hear/read +Schneider's original words. I did not get the impression from this video that he thinks it's
likely that SVs would "talk" to Rome, or that he was
hinting that Rome should unilaterally grant them the same types of faculties that they extended to the SSPX, or any such thing. What I thought I heard was him pointing out that Rome is somewhat hypocritical if they can have ecuмenical talks etc. with Orthodox (i.e. non-Catholics), treating SVs as less Catholic than non-Catholic "Orthodox".
Schneider said the “ecuмenical dialogue” with which the Vatican has been “very much engaged” in with the Orthodox in past decades should, if the Holy See is being consistent, be extended to sedevacantists, since they are “closer to us than the orthodox,” and “do not deny any dogma directly,” including the dogma of the primacy of the pope.
He thinks an effort to approach sedevacantists, however, “would be only possible when in Rome, Divine Providence will grant again strong and courageous … orthodox popes, who proclaim and promote the complete integrity of the Catholic faith, liturgy and morals.”