Earlier quoted context omitted.
I guess the other issue is why was the review happening 4 months after the period ended, especially if they had started working on improvements in the meantime. What was the point of all that work / those improvements, if they were just going to ignore it because it wasn't in the "correct period?" Shouldn't the review have happened closer to the end of the period, so that all of that progress could be part of improve…
There's a book (I can't recall the name) written by a former HR professional on the actual function of HR in a corporation: a way to mitigate liability when firing people. That seems like the most plausible scenario given what I am reading from this blog post. If you were going to fire a well-known activist and you did not want to give away any ammunition for getting sued, there's a whole song and dance to make sure…
As someone who has poohpoohed the idea of a human resources department in a large company, I've almost done a 180 on it now that I have a small company of my own and I'd be very interested in reading some good books on the utility and function of the organisation in a large company.