Het RAPTOR means Het Red Eyes, you are right you cant have Het Tang or CT. But noone ever said Het RAPTOR, means it is Het for each trait included in the acronym.
What else would APTOR Het for RAPTOR mean? Cant be Het APTOR, if it is one. Its the "R" part he is talking about. Het APTOR Het RAPTOR means nothing more than an APTOR, that is Het for Red Eyes.