Sometime, departmental heads will try their best to save themselves. In order to meet the downsizing target they will find as many people to get rid of in order to save themselves. It is common to see this happen in many companies. Just that, most will hide it as rehiring for replacements (which usually at a lower budget but with bigger tasks to assume than previous leaving staff). In tweeter case, decisions might be sub-optimal when Elon took over. Anyway, recession is around the corner, so tweeter can easily find the best when market is in a slump in coming 3 mths.