Well like many settings, sorcerers can perceive when somebody else has a spark of the supernatural. So any serious wizard or witch would see right through it. Anyone that was paying enough attention would notice it too. 

Destiny or any League sorcerer would probably out him to the other members, because that kind of deception is not needed and might actually be harmful in a team environment. That raises the questions of why he would even pretend to be a sorcerer because being a pure gadget hero is a valid choice. I could see him being a classic stage magician type with a sense of style though.