According to WSJ, her NDA permits disclosure to Congress, regulatory bodies like the SEC, and law enforcement. The disclosure to the press (the public) however is a different question.

Transcript as alternative to YouTube

https://archive.org/details/CSPAN_20211006_050100_Facebook_W...

Thanks very much for the transcript.

Relevant quote (mangled grammar in original):

We will do anything and everthing to protect and stop any retaliation against you in any legal action the company may bring or anyone else, with that made very clear in the course of these proceedings.

At the 1:35 a.m. timestamp.

https://archive.org/details/CSPAN_20211006_050100_Facebook_W...

I imagine they might haul Zuckerberg before the committee and spend a few hours asking him variations on "Why are you retaliating against Haugen?"

Yeah. The promise of protection would ring less hollow if it were made by the executive branch (and even then, that kind of promise often lasts until the next administration...).

How likely is it that Congress or any regulatory body would be asking for whistleblowers if none ever talked to the press?

Press is the fourth estate, even if news as a profit center has tainted their motives of late.