I don't understand what you are saying is impossible about this.
Are you just saying "try it and be really careful about it and you will see that it is impossible"? Because I don't see why that claim should be convincing without, saying why?
(Maybe I missed some other comment of yours?)
All Turing complete systems used in practice are distributed at some scale so your argument is non-sense.
No, actually they haven't. Try and explain how a distributed system should be Turing complete in a scientific paper and you'd notice its not possible. Eventually this will be discovered and this blockchain will implode. The centralised team doesn't even claim that the chain will last - they want to migrate to PoS.