No confusion here. It's self evident that if you are already the target of investigation then the police are likely monitoring you via a host of direct means. But this is seperate and distinct from the efficacy of a suitable vpn, or encrypted routing protocol where you are not already the target of investigation, which is effectively the the entire population minus a very small number of individuals.
If you want to **** post on Pprune or anywhere else and take suitable steps, you will never be found. Simple as that.
Anyone who uses a vpn based in China is an idiot. For any Vpn based outside of China, who cares what the CCP think. They have little control over it beyond playing whack a mole with the gateway ip's.