[SideburnsOfDoom]

> But I don't get how they went from that to "estimations are bad".

If "estimations" means the usual, i.e. asking "Ok everyone, how long do you think this task will take to complete?" then yes, that is largely a waste of everyone's time. Those estimations are bad.

> they're just doing better estimations now by looking at historical data

Yes, better estimates are coming from data. The people aren't "doing estimation" any more, it's being automatically calculated. Doing estimation takes time and give wildly wrong results.