Not true, for example, the Church holds that the definition of Marriage applies to others, not just Roman Catholics.
In addition, we Confess ONE Baptism. There really is only the Catholic Church that anyone can be Baptized into, for there is no other Body of Christ.
The catechism defines what heresy is, it does not say who IS one, or give us the right to apply the label to anyone. There is a difference between a definition and a flesh, blood, and soul person. Modern day Protestants are not heretics and should not be labeled as such.
I did not say that I had that authority, I will say that the Church does, and therefore I must accept any whom the Church states commits the errors outlined in CCC 2089
There is plenty of searchable discussion on this by authoritative posters here.
Such as the Catholic Encylopedia
** The heretical tenets may be ignorance of the true creed, erroneous judgment, imperfect apprehension and comprehension of dogmas: in none of these does the will play an appreciable part, wherefore one of the necessary conditions of sinfulness–free choice–is wanting and such heresy is merely objective, or material. **
That would be material heresy, not sinful, but the term would still apply to someone, for example, who denies the Authority of the Papacy, or the doctrine of the Assumption.
I am not saying that such a person, as described above, is consider by the Church to be guiltily of anything, or in sin because of it ( quite to the contrary) , but they still are a material heretic.
Heresy thus willed is imputable to the subject and carries with it a varying degree of guilt; it is called formal, because to the material error it adds the informative element of “freely willed”.
And this is formal heresy, specifically willed.