sweeney does not do anything to conceal his identity except change his name he literally takes on the same profession in the same building and somehow nobody is like “hey isn’t that the guy who used to work there?? he’s back???”
apparently people don’t recognize you anymore once you become a goth or something
“hey isn’t that benjamin barker? i thought he was sent off…”
“no, that can’t be him! benjamin barker was a prep. this is sweeney todd, the goth barber of fleet street.”