Earlier quoted context omitted.
> If there was a way to determine the least performing 50% of employees in a matter of two days, they wouldn't be there in the first place anymore. This would assume that the previous management had an incentive to cut costs and remove 50% of their workforce... which is probably not the case at all.
What makes you think that previous management needlessly employed unproductive workers when they could have easily not done so? Do you think that Elon Musk has some special magic insight that makes him get the same amount of work done with half the resources? I know some people at Twitter and some people at Musk's companies and I don't think they are fundamentally run differently.
Your original comment stated: "If there was a way to determine the least performing 50% of employees in a matter of two days, they wouldn't be there in the first place anymore."
Therefore you, not I, implied that there are relatively unproductive workers at Twitter (not unreasonable, of course - there's always going to be a performance spectrum) - and you suggested that the previous management would have removed them if there was an easy way to identify them.
This is what I was disagreeing with - your premise that the previous management would have removed their most unproductive 50% if there was an easy way to identify them.