Why would it be wrong to clawback for lack of performance for the years that led up to Boeing’s reckoning? It’s not like it all happened in 2019. Contracts can be changed as business conditions change, or you’re found to be contributing to an environment where you’re flying the business towards the ground.
CEO was overpaid for failing (so much so Boeing had to fish for a $10B credit line), take back some of the comp and distribute it as additional severance to workers impacted by said executive failure.