Good attrition?

We have the worst senior manager for our group the past couple years. He keep focused on "growing his empire" and nothing else. Therefore, he spend all his time either recruiting new team members or getting his boss's approval for more headcount. What he don't care to fix is complete poor handling of team's projects and high oncall ops leading to even higher turnover than normal Amazon level of turnover. For most teams, 25-50% turnover every year. For our teams, its 75% for engineers and 100% for managers every year. When some of us tried to take our concern regarding bad management approach to his boss, he told us "all of our team attrition is good attrition because the old people weren't good amazonians." He must not care because if our senior manager "grows his empire", that will also grow the empire of his boss. These people are really bad managers, but Amazon continues to reward them with growing careers even though they scare away so many good engineers and managers.