This is a sign that there are extremely right safety standards and lots of oversight. The amount of documentation needed for all aerospace parts means it is quite difficult to falsify records for long without getting caught. The fact that any of these types of event are big news and often result in arrests should help you be confident that the standards are real and enforced. There will always be bad actors, and finding them like this is part of reality. Just look at the safety record of commercial aviation to see proof that the system is working.
It's redundant because there's basically a circular argument that G and C are using to not respond to the workers. Workers want to C negotiate with G on the terms of their work with G but C says they can't because they're just contracting with G. Then G says the workers can't negotiate with G because they work for C. Both companies point the finger at the other as to why they can't help and just give nothing back to the workers.