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]
(..) - An audition. - An audition for what? - Doesn't matter. You failed. We extracted every bit of information you had in there. But your deception was obvious. [EDITH PIAF'S "NON, JE NE REGRETTE RIEN" PLAYING] - So leave me and go. - You don't seem to understand, Mr. Saito. (..)2010 Inception