The good-parity unitary representation conjecture

Let $G$ be a classical group, and let $\pi$ be an irreducible unitary representation of $G$ of good parity. A representation is of Arthur type when it belongs to an Arthur packet. Good-parity conjecture. The representation $\pi$ is unitary if and only if it is of Arthur type.

The claim concerns the proposed characterization of good-parity unitary representations by Arthur representations. Its resolution is not established by the supplied text.