Hi, I remember you.
Is it possible he needs to deprogram himself from the actual jw doctrines? Would he be willing to write down a list of specific beliefs that cause his angst, and then pick one at a time to examine in depth?
You can guide him to finding specific jw literature citations on each topic that would cause unbelief in pretty much any reasonable person, and I'm sure you'd get a lot of help from the posters here.