If the SSPX say ‘yes’ I am inclined to think ‘no’.
The fact that the SSPX say “yes” clearly subtracts from the credibility of the document, considering they have disagreed with all the popes going back to Paul VI. Christopher Ferrara, another signer, joined with a suspended priest and tried to get the atheistic EU government to put political and legal pressure on Pope Benedict because that pope failed to meet Mr. Ferrara’s requirements on Fatima.
A few of the other signatories appear to have no special theological credentials that I know of, which does not mean they are wrong on this. The media appears to have implicitly granted everyone a doctorate in Theology. If Bishop Gracida added his name, that does add some credibility.
Sadly I think something
does need to be done, but this is not the group of people to initiate it. It makes things worse, because, suppose next month, a group of people who are far, far more credible, in terms of both orthodoxy and theological credentials, does something like this. The media will then say, “sure, one more of these things again”. The “friends of the pope” will hold press conferences, and say, “We ignore all these things. The boy is crying wolf again”.
It’s not out of fear that the vast majority of bishops and orthodox theologians will not put their signature alongside some of these names.