What are you on? Taking away someone's naturalized dual citizenship is done by the judicial system via due process according to the draft proposal, not on the spot by police or whatever nonsense you imagine it.
If only you would have skimmed the proposal paper before commenting instead of getting your knickers in a twist over stuff you made up in your head, you would have saved us all the wasted time.
>I have no idea why anyone would believe making it effectively impossible to ever leave
They can leave with their other citizenship, genius. This law applies only to dual citizens, since you aren't allowed to make citizens stateless, Einstein. It's even written in the proposal which of course you haven't read but have strong options against it.