Well that's plausible, in the same way that we are all given training to avoid violating laws in other counties, and if we do the company may not be liable if they did not give you direction for your actions and in fact did provide training that contradicted it.
Piotr D. had been working until recently for different branches of Polish Security Services at top positions. He had been responsible for implementation of SŁR (Government Secure Network) - a communication network for government VIPs.
As for china, I suspect they'll arrest a polish or a poland-linked exec/official of some kind just like they did with canada or enact sanctions on poland. They have to respond or they'll look weak. It's geopolitics 101.
Tit-for-tat, I doubt he was just discovered as a spy