To me it seems clear that the notion of “harvesting of souls” is a somewhat misleading term.
Anybody, including myself, who consciously visits the sixth (or higher) dimension certainly knows that the sixth dimension (like all higher dimensions beyond it) is a formless world. That means there is no such thing as form to be found anywhere there. “Form” includes anything that’s structure, any kind of body, any merkaba or crystal or stargate or whatever. You may ask: “If I don’t have a body there, how is it that I still exist?” Answer: in any sense in which you are an “I” rather than an “it”, or a dynamic, free, pure, blissful “subject” as distinct from a passive “object”. In the sixth dimension, therefore, any form of harvesting is impossible.
I realize that when we die we initially all are in the fourth dimension. Yes, there are all kinds of corruption and trickery there, though not nearly as great as in the third dimension. Why not as great? Because in the fourth dimension you instantly travel to whoever or whatever you think of, so you get fuller and quicker answers to all your questions. You can demand of any being that they show you their true identity and motives, and they have no choice but to do so.
It’s certainly possible for us to get trapped in the fourth dimension, but only if we haven’t learnt how to regularly visit the sixth dimension through meditation. And if we haven’t learnt to be very good meditators, that means that we’ve chosen to spend time experiencing the many traps of the third and fourth dimensions – whether we consciously remember that choice or not. As the Buddha said, the entire physical world is one big trap. So from my point of view, any “harvesting of souls” is just another fourth-dimensional trap and everything in the fourth dimension is a trap. If you’re “harvested”, I don’t see that as something necessarily as sinister as what many imply. Here in the three-dimensional world, don’t we all get “harvested” by employers, by teachers, by parents and siblings and peers, by taxes, by health problems, by entertainment, by the internet, and so on? It's illusion within illusion, folks. We were meant to find a way to enjoy the ride. Seriously. (We are all eternal beings who've been playing with how "far out" we can go.)