Every single one of those founders who come on HN and give honest opinions also wrote press releases just like this.
You have not heard from Elisabeth Holmes because of this, you've heard from the CEO of Theranos, whose name is Elisabeth Holmes. I don't know what she has/hasn't learned, but the audience for this was not HN, and she's not giving her personal experience in this letter.
Writing for yourself is completely different than writing for a company, but you know that. Come on, we can do better.
Contrast that with this, where instead of owning literally any responsibility for the farce that their product was, she continues to go on this same distortion tactic: Never say anything that's actually a lie, just say a whole lot of things that aren't the truth.
The only thing she seems to have learned is a lot of regulation that her company ran into, and how to work around it.