From Washington Examiner :
Arthur Rizer, a former Army officer and DOJ prosecutor who leads  the R Street Institute’s criminal justice team, said he doubts the law guarantees whistleblower anonymity.
“I am pretty sure on its plain reading only the individual who receives the complaint has a ‘statutory obligation’ to keep anonymity — and, I think, even then there are circumstances where the veil of anonymity can be pierced,” Rizer told the Washington Examiner. “So, as a starting point, the chairman’s comment is vague and overbroad — and legally speaking, that makes him wrong.”
- “Washington Examiner”: https://www.washingtonexaminer.com/news/analysis-despite-schiffs-claims-whistleblower-has-no-statutory-right-to-anonymity
- “leads”: https://www.rstreet.org/team/arthur-rizer/