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]
(..) is pushing it. The price for leading a double life, I fear. Your theatrics made an impression. BRUCE: Theatricality and deception... ...are powerful weapons, Alfred. This is a good start. If those are to be the first of many injuries to come... ...it would be wise (..)2005 Batman Begins
(..) is a matter of patience and agility. Always mind your surroundings. Ninjitsu employs explosive powders. - As weapons? - Or distractions. Theatricality and deception are powerful agents. You must become more than just a man in the mind of your opponent. [MAN SPEAKING FOREIGN LANGUAGE] (..)2005 Batman Begins