I specifically made clear it isn’t the fact that they violate Torah laws, that they are aware are Torah prohibitions, that makes them apikorsum. Many people, out of weakness or otherwise, regularly violate Torah laws. They are not apikorsum as they do not deny the Torah prohibition’s binding nature, even when they’re violating it.
What makes them apikorsum is the fact that they know something is a Torah law and, yet, they declare that they reject the applicability of said Torah law. Even if they never violate said Torah law they are, nevertheless, apikorsum.