That was my first thought, too. It seems quite plausible that the exact skills suited to doing well in sales (competitiveness, focus on short-term gains, etc.)

That was my first thought, too. It seems quite plausible that the exact skills suited to doing well in sales (competitiveness, focus on short-term gains, etc.) may be the exact opposite of skills suited for managing. The article's generalization from a specific employee type to all employees is unfounded.