[bell-cot]

"We have data on the performance of >50K engineers from 100s of companies."

Sounds to me like "we have some very common performance metrics on a huge number of people...the great majority of whom are old hands at gaming metrics".

If you are looking to downsize - the first places to look are both ends of the bell curves for well-known metrics, both ends of the pay curve, and upstream from the worst of the bad decisions, drama, and tensions.