That would require that a "simplified tax return" is not a "tax return". If that's the intention, it seems to fly directly in the face of the common use of the

That would require that a "simplified tax return" is not a "tax return". If that's the intention, it seems to fly directly in the face of the common use of the English language. Generally {ADJECTIVE} {NOUN} is a specific category of a {NOUN}. If they're using some domain-specific jargon that violates that, it strains credulity that they would expect anyone to understand it.