I don't think they were anonymous to the people they blew the whistle to. I think the people they blew the whistle to are keeping them anonymous to the public.
>Now, Representative Brad Wenstrup (R–OH) ... says his panel and the House’s Permanent Select Committee on Intelligence have heard testimony from a whistleblower “who presents as a highly credible senior-level CIA officer.”
>Now, Representative Brad Wenstrup (R–OH) ... says his panel and the House’s Permanent Select Committee on Intelligence have heard testimony from a whistleblower “who presents as a highly credible senior-level CIA officer.”