FlightlessParrot I don't believe you're inclined much, if at all, to commit thread drift by getting into the law applicable to the scope of mandatory subjects of collective bargaining. If it is preferred to adhere to a point of view by which a decision to build a plant in a right-to-work state was taken because of that legal status (of South Carolina) and it was just that simple, then there isn't much to discuss anyway.
Evidence . . . well, neither Ostrower reporting nor descriptions by Airbus_A350 of what people he's talked with have said, are evidence. And while I'm not questioning the veracity of either source the point was (in the post about whistleblowers) that caution should be exercised before taking at face value all reports of what they blew their whistles about.
The decline and fall of Boeing is not something especially in dispute. Nevertheless that set of facts and inferences is not the same thing as grappling directly with the facts about the manufacturing tolerances, inspection or other related processes, internal controls, and reporting to FAA. Or the same thing as the context noted by dastocks.