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To ask for the right to teach the Faith and condemn the errors of Vatican II against the same Faith WITHOUT AT THE SAME TIME demanding Rome to do the same, it implicitly but necessarily follows that Rome also has the right to teach those errors it currently holds. The SSPX leaders are hence co-operating in objective grave sin, at least on the level of principle, because it reduces the Faith to opinions.

Yes. You are right

To ask for the right to teach the Faith and condemn the errors of Vatican II against the same Faith WITHOUT AT THE SAME TIME demanding Rome to do the same, it implicitly but necessarily follows that Rome also has the right to teach those errors it currently holds. The SSPX leaders are hence co-operating in objective grave sin, at least on the level of principle, because it reduces the Faith to opinions.

What HEBF* has done in this SARD is to proclaim the condemned errors
of the Sillon all over again.  

In Pascendi Dominici Gregis, Pope St. Pius X (curiously the very
namesake of the Society HEBF now deceives and misleads) condemned
the errors of the French Sillon by name.  The original docuмent was
to the French bishops written in French, since it was a French problem,
but later, he went universal on the principles with Pascendi.

And here, HEBF, who was trained in combat against Modernism, the
Grand Sewer of All Heresies, now turns around and takes a bath in
the same sewage.  

The Sillon was all about religious liberty, that you can believe what you
want, and I can believe what I want, and let's just all get along.  

Rodney King would have fit right in with the Sillon.  The Foothill Division
Police Department is still operational in Pacoima, CA, on Osborne St.

So this SARD asks for the right to teach the Faith and condemn the
errors of Vat.II, while others can adhere to the same errors and that's
okay with HEBF because he's eager to get along with heretics.  It's one
big, unhappy sewer-dwelling family pretending to be happy.