Not exactly. The CNN article doesn't say that, and The Verge's piece[1] on this puts it together pretty clearly.

>Zatko was fired by Twitter in January and claims that this was retaliation for his refusal to stay quiet about the company’s vulnerabilities. Last month, he filed a complaint with the Securities and Exchange Commission (SEC) that accuses Twitter of deceiving shareholders and violating an agreement it made with the Federal Trade Commission (FTC) to uphold certain security standards. His complaints, totaling more than 200 pages, were obtained by CNN and The Washington Post and published in redacted form this morning.

So, breaking it down more concisely:

1.) Fired in January

2.) Musk tries to buy Twitter in early April

3.) Complaint filed with SEC in July by Mudge ("way [after] EM entered the picture")

4.) WaPo published redacted, 200-page report today

[1]https://www.theverge.com/2022/8/23/23317857/twitter-whistleb...

Edit: This is not an endorsement of mud-slinging, just an attempt to make sure everyone knows what actually happened and when, at least as best we can discern at this point.