Dissatisfied employees and dissatisfied managers can be a good source of improvement.
Two prerequisites are necessary:
1. Exemplary behavior or a desire for change
2. Constructive criticism
If neither is present, it is destructive criticism, which ultimately only damages morale.
I don't see exemplary behavior in Olivier. His criticism of management is the usual platitudes heard in every company—no matter how well or poorly the company is doing.
I firmly believe he's hoping for a job at NVIDIA.
But even at NVIDIA, not everything that glitters is gold.