We all know that this is not news about Uber's workplace. It has been happening for quite a while. I bet those executives knew about it a long time ago. What has motivated executives to take it seriously now? Why now?
More importantly: someone who not only called them on it, but appears to have documentation to back up her claims. Which blows up many of the usual strategies a company would employ to discredit an ex-employee making such claims, and also threatens to trap them even further (the smart thing is to keep good records; the really smart thing is to only disclose part of what's in your records, let the other party respond and likely lie about something you have records of but didn't yet disclose, then nail them on the lie).
Because now it's in the news, following the recent blog post.