That doesn't strike me as odd at all. Companies should track attrition. It's a metric that should be watched, and if it goes up over time, that should be alarming. The problem is that managers are apparently graded on this metric:
> Managers are even evaluated using this metric, known as "unregretted attrition rate" (URA).
... which is just completely bizarre. Basing part of a manager's performance review based on whether or not they fired enough people to match a company-wide expected attrition rate is completely bonkers. Managers should possibly be penalized if they fire (or lose) too many people (it shows that either they are really bad at hiring, or that their people hate them and leave), but being below that number shouldn't generally be cause for alarm. Certainly it could mean that a manager is keeping dead weight around, but that shouldn't be the default assumption.