Lazer,
That is not correct. The Syllabus is a magesterial condemnation of errors: many theological manuals prior to Vatican II even taught that the document was infallible, and it does seem to meet the 4 necessary conditions.
We should also realize that the errors condemned in the Syllabus had already been condemned previously. All Pius IX did was to organize these already-condemned-errors and condemned them once agains because they were still spreading.
Many people today adhere to these errors, and as such, seek to find a way to justify it. They do so by giving the argument you gave above. But this is completely false. The syllabus is at least part of the ordinary magisterium which is considered infallible, even if it was not explicitly ex-cathedra.
The following is take from “Quanta Cura”, the encyclical that accompanied by the Syllabus of Errors:
- “…Amid so great a perversity of depraved opinions, We, remembering Our Apostolic duty, and solicitous before all things for Our most holy Religion, for sound doctrine, for the salvation of the souls confided to Us, and for the welfare of human Society itself, have considered the moment opportune to raise anew Our Apostolic voice. Therefore do We, by our Apostolic authority, reprobate denounce and condemn, in general and in particular all the evil opinions and doctrines specially mentioned in this Letter, and We will and We command that they may be held as reprobated, denounced, and condemned by all the children of the Catholic Church…”*
Sounds like an ex-cathedra document to me.
Anyone who adheres to any of these errors in under the codemnation of the Church.
The only thing that can be changed are disciplinary matters; not truth and error.