The new rite of ordination, I have changed my position on, I now think that it is valid. ( I was convinced by Fr Hesse's arguments. He was a canon lawyer with something like a double PhD in theology, and I, conceding that he is more learned than I am on these matters, changed my mind, I did not assume that he was of bad will or deceiving people).
So though I don't think Francis is a pope, I think the sacraments of the novus ordo rite priests are valid. I would not go to a novus ordo mass, but I think the blessed sacrament is present there.
Strangely enough, except for holding that Francis 1 is not a valid pope, I think this is the position of the SSPX.
I was hoping that should I ever be a monk I can avoid talking about it since they wont exactly require a profession of faith in the pope from me. I don't want to be a priest, and from what I understand, if a pope's name is mentioned in a mass ( has to be TLM for me) and he is not a valid pope, there is no sin, but if he is not mentioned, and he was valid, then there is a sin. I am sure Francis 1 is a heretic, but whether he is valid I will wait until I am enlightened by others who know more about this than I do before I decide, but at the moment I don't think he is.
But this thread was about whether if in a monastery I should hide my opinion about the "pope"?