In my view, a "whistleblower" is someone who gives their information confidentially (not anonymously) to a responsible investigating authority.
Not someone who writes a comment on the internet that you or I could write ourselves, with a little research sprinkled with credible-sounding 'insider chit-chat'.
This company's incompetence killed 346 people in 2018-2019, and the postmortem revealed an unethically cozy relationship with their regulator, the FAA. Now, five years later, we are seeing more catastrophic failures that will eventually claim more lives, and once again the FAA is coming under scrutiny for being too lax in its oversight of Boeing.
It seems to me that the FAA lacks some kind of either technical or organizational competence to regulate Boeing. Screws must be turned publicly until Boeing's financier-led culture is replaced with the original engineering-led culture. Anonymous insider comments are one reasonable way to do this, although it might be better to work as an anonymous source to a well-known journalistic outlet.
It wasn't incompetence, it was greed. They said "no new training for pilots" in order to keep sales volume up and to ensure no new training they kept the MCAS system a secret from pilots.
Or maybe we could wait another 20 years: https://www.airliners.net/forum/viewtopic.php?t=213075