so you would revoke credit from Turing?

Credit for what? The theoretical work for which Turing is most known - the concept of Turing machines and undecidability - was published publicly and before the war. He did not contribute to the design of a physical computer until after the war. Colossus, the code-breaking "computer", was not of his design (and the man who did design it is not at all famous for it).

Did anyone else discover what he did before his work became public?

yep, eniac and univac were the the first publicly known computers. it became known later that turing’s work predated eniac.

It's not a question of credit, it's a question of attribution and historical accuracy.