Ah seems it's an invention of someone that appeared on Alone season 7.
Was wondering why didn't see it in the show, and it's because the inventor, lost his ferro rod on day 9 and quit.
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I guess that means that you don't know.
Theres a design shown on Youtube where they use a chisel set in a hole so its like a pencil sharpener. Think Izzy Swan showed it.
Do you find it much better than just an auger and a knife for shaping the tenon? The chisel cutter seems the weak part of the design to me, though I see were it's going. If you're chiseling wood that's only a bit oversized anyway, shaping it down with a knife possibly isn't much work and then add a wedge to tighten?