"I wouldn't be surprised if they tried to release letters that were not true but in a rue to catch bethelites or elders who leak out..."
This is always a possibility, but as I've mentioned before, denial/deception and other intelligence/counter-intelligence issues, especially at the large, multi-national corporate level, are very complicated things to develop, implement and manage effectively.
These types of 'games' if you will often require separate dedicated departments, and they are almost always the most secretive and highly controlled departments. To accomplish this effectively, the Dark Lords would have to expend a lot of resources and have contingency plans for unintended consequences, denial, spin masters, etc.
So many on this site routinely point out that the Dark Lords aren't bright enough to get in out of the rain; it is highly implausible that they are bright enough to effectively develop and manage such a highly complex process.
If they are stupid enough to try this, then that means the mean old apostates have a hook in their mouths. And that would be most excellent.