Is there a benefit to my targeted client’s delusional states? Is he working through something within himself in a process that helps him cope or is this largely destructive?

Unfortunately, this is a combination of effects and influences. The primary need for this is the perturbations within, caused by ongoing programming efforts of the interlopers to keep him off-balance and to distort his thinking along the lines encouraged by his prior healer and the influencers working through him. So he has the memories of all of the lore and instructions imparted to him and still believes in their importance and this is going on within him at a deep subconscious level now, and that is the part resulting in the triggering. Then both his deep subconscious and his conscious self will attend to these inner concerns as best they can, in a sense, working in parallel but not working together directly. This does enable him to cope by giving him an activity he believes will be helpful. It is largely make-work, so other than perpetuating the perceived need for these rituals it will not be greatly harmful to his being to still hold beliefs that there is value in what he is doing. So this is a sign of inner strength at least, that he is able to wrestle with these concerns and tame them to an extent he can return to a prior state of equanimity with his emotions. So that is all to the good. He would be better off without these inner notions because they are confusing and seem quite forbidding and arouse much fear in him because of his negative karmic history with so many lifetimes of failure. So when he is given illogical and impossible tasks to perform metaphysically, this will stir up inner fear and fear of failure as well, and is the unfortunate consequence of being manipulated in this way. This preoccupation will fade in time as he gains strength from the ongoing healing work. He will begin to need to rely on this interior work less and less and this will allow it to fade into the background eventually.