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It seems that the two opposing sides of this discussion would have two very different explanations for what is going on.
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What happened in the life of Fr. Da Silva to make him go from praying for the Pope in his Masses to not praying for the Pope because he thinks Francis is not a pope?
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Did he read something, if so, what?
Did he speak with someone and accept their counsel, if so, whom?
Did he have a private revelation from God? If so, he would have to have said that he did.
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Nobody goes to bed one day and wakes up the next sedevacantist. It doesn't work that way. Something made this happen.