I would emphatically agree with you that they are/should be considered heretics as defined by dogmatic Catholic teaching. Still, I've heard quite a few, shall we say unusual things from FRCatholics that I would think (hope) are heretical by Catholic standards. At the very least they contradict equally dogmatic statements made by other FRCatholics. Drop by the Luther/Erasmus thread sometime to get a sample of what I'm talking about.
The only other possibility I can envision is that what Rome considers "dogmatic Catholic teaching" allows for a far broader and looser layperson interpretation, than what we Protestants think "dogmatic Catholic teaching" allows.
The Dogma is basic, core, foundational beliefs. Things like Father, Son, and Holy Spirit. Jesus' Resurrection and ascension. Things like that. I would say that most protestants agree with us on the dogma if it weren't for these churches out there trying to redefine the trinity now.
It's the Doctrine that you can still argue about a little. Not much though.
Law is created to protect the doctrine. Laws can be changed.
Any Catholic can SAY anything he or she wants about their own opinion of what the Church teaches. All you have to do is read the Catechism to know what the Church ACTUALLY teaches.