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]
(..) You tricked him. Just say it, you little devil. Say it: you tricked the magician. Occasionally, a touch of deception goes a long way. Bones, even you are capable of a little magic. Which is why I slipped a dollar under Christine's pillow when I kissed her good night. (..)2015 TvShow: Bones Title: The Promise in the Palace Season: 11 Episode 7