It sounds pretty strange to me. If I need to add charcoal during a cook it means I didn't load enough charcoal before I started cooking.
I think the person is overestimating the demand for a burner among Egg owners. One of the strengths of the Egg is to be able to do long cooks without needing to refuel. I'm sure your burner has many useful applications but I don't think an Egg or any kamado style cooker would need one. In addition, I would imagine use of any burner with an Egg could void the BGE warranty.
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