Does it bar the EU and China from conducting their own criminal investigation, ask for extradition of the management team and/or impose their own fines?
Well, at the level they're at, and considering the strategic and military considerations, everybody does it. I'm reasonably sure EU countries do the same with Airbus, and I'm European.
Which, by the way, is totally not state support, especially if anyone from Airbus is within hearing distance...