FWIW, the employees in question are at least in the 90th percentile of US salaries if not 99th percentile (L5 is ~ $250K, L6 is ~ $399K, and L7 is north of $500K)

In regards to fairness, many times these cuts are based what group you are in, rather than performance. You wonder, hypothetically, would the L5s and above all agree to accepting a 20% pay cut in exchange for not having layoffs. It strange that one person keeps the job paying $500K, while the other unlucky one will have trouble getting a new $150K job due to the terrible job market.