TPTB gave out false information once
I wouldn't say pseudonymously crediting an actor is the same thing as giving out false information. It's not like they called attention to it or actively spread a rumor. It was something people had to go looking for in the credits. It was more like passive camouflage than active deception.
On the other hand, there have been cases in other Trek productions where people have actively stated falsehoods to conceal a spoiler. I remember Alice Eve being asked in an interview whether Cumberbatch's "John Harrison" was Khan, and she blurted out "He's not Khan" immediately and emphatically. I think Simon Pegg issued similar denials.