Actions speak louder than words. If she were truly sorry, she would’ve reverted the PR and have it go through the normal process. Instead she wrote a really long message about how the .NET Foundation owns your project.
Yes, but the author wasn't the one that reverted it.
It was (rightly) reverted almost immediately after it was first committed, a week ago. I wouldn't expect the author of this apology - posted today - to have instantaneously realized the error of their ways and ever had the chance to do the revert themselves, and I don't think that reflects on whether the apology is sincere or not.