So the company is not saying, "Don't raise concerns about illegality." They're saying, "Don't raise them to your manager, but instead to the legal team."
Large companies tend to set up internal processes for such complaints to ensure that they go to the right people (i.e. your manager is probably not the right person anyway) and that they remain legally privileged when possible.
Based on the news reports (and not the content of the suit), it seems to me the filer is not aware of what is common (and frankly not worrisome) behavior at large companies. People get fired for leaking product details; legal discussions should happen with lawyers; companies commonly have contracts prohibiting discussion of wages but those contracts are usually unenforceable because in the US labor relations regulations actually protect such actions from retribution.