Don't be disingenuous. They clearly say that silencers aren't silencing like in the movies and don't compare dorner to SEAL's. You're reaching.

Dorner does support it. He killed cops and no one reported gunshots when the police figured they should have. His suppressors were effective.

You're speaking in absolute terms and that in itself is dishonest. They won't make gunfire absolutely undetectable. They can make the sound and flash less detectable. They are effective. They work. Whether that's for killing cops more quietly or hunting with less potential hearing damage; they serve their purpose.