The problem with this entire idea is that they have no proof for even the fundamental foundation of their argument. So the argument is that munus and ministerium mean two different things, and are mutually exclusive, and that Benny renounced one of them but not the other. Even assuming Benedict was a true pope in the first place, just looking at that argument gets you nowhere. If you look those two words up in the dictionary, you see that there is a large amount of overlap in their meanings. They are more or less synonymous. And when Mazza was asked about this in the video, he sort of hemmed and hawed and said, "Well, you have to look at the context and get the meaning from there," and did not provide any concrete proof that Benedict meant one meaning for one word, and a different meaning for the other word.
So the whole argument based on the distinction between munus and ministerium doesn't even get to first base. That's before you even consider that Benedict said he resigned, that the office would be vacant when he resigned, that he resigned freely, and clarified multiple times that he resigned.
Then these people have us attempting to interpret the words of Benedict's secretary as a way of reading Benedict's mind, and saying that obviously Benedict was being threatened with death by a sodomite "mafia" (no proof of that either) ... the whole thing is a desperate attempt to get out of having to say that Francis is the pope.