When the new boss fires the CFO, it often means that some kind of "creative" accounting had been going on. This alone is worth the price drop.
As to the BSN article, CFO is typically sort of like the XO in the military. If the rank and file hate the Commander/CEO, it often leads to subpar performance. So, all the shitty decisions that the commander has to do get passed through the XO so that they all hate him and not the commander. AMD went through some pretty hard financial times, they absolutely had to fire people, cut benefits, and generally do mean things. If the rank and file didn't hate the CFO I'd be very surprised.
Of course, this does not necessarily mean that the CFO is innocent or competent. Just that no matter how good engineers the interviewees were, you couldn't reasonably expect them to say anything else.