I leave a link to the video where Father Rodrigo Da Silva explains his situation. It is in Portuguese only. Promise more explanatory videos.
Summary explanation of what I could understand:
He waited a prudential time to see the attitude of the bishops of the so-called "Resistance", especially Dom Tomas.
Before the appearance of the statement on his separation, he explains that on what has been said of acts of disobedience, he will not enter into personal questions, so he will not respond to these false accusations. He only explains why he adopted the Sedevacante position.
During his formation, he spoke with important priests of the so-called "resistance", especially those of sedevacatory position. This led him to speak with Dom Tomas about how he could not in conscience pray for a formal heretic like Bergoglio (he cites Dom Guéranger as a source and the classic explanations of the vacant See). Given that explanation, he claims not to get an answer from Dom Tomás. Days later appears the famous statement about his separation from the SAJM.
Then he goes on to quote the classic position of the sedevacantists, using Dom Guéranger and other authors who do not understand who they are because they are cited in Portuguese.
He continues with the incoherent position of the so-called "resistance" to resist and recognize, criticizes the attitude of bishops who wish to collaborate with sedevacantist priests and then oppress them or try to impose their position. In addition to talking about the incompetence of the bishops in the management of the SAJM (for this he recommends reading articles from LA SAPINIERE, and from sedevacantist priests of what he claims to be "resistance".
At the moment he directs the chapel of San Pablo (Brazil), that happened to his hands and maintained by some lay people that went with him (something more than 20 people). He was also joined by 4 Franciscan friars coming from modernism and the Conceptionist Franciscan friars (number 3), also from modernism, who after being with FSSPX and a year with Dom Tomás, left. In addition, there is a Carmelite nun coming out of modernism (it is not cloistered).
I wonder: What do the bishops hide?