It was a misunderstanding on her part, not a deliberate 'deception' on his (part). [=he didn't try to deceive her or lie to her]
The article describes the government's use of 'deception' [='deceit'] to gain public support for the program.
She 'practiced deception' on her unsuspecting clients. [=she deceived them]
(..) Hey, dude. l'm not what you think l am. Baby, we all got secrets. That's okay. Are you telling me that you are not.... -Yeah. l'm not a woman. -White? The deception! The betrayal, man! You deceived me! Calm down. l'm an FBl agent. l was uncovering a-- Negro, please! Didn't somebody tell you (..)2004 White Chicks