This thing should have gone straight back to the shop.
Look at those sharp, springy, “self-adjusting” (ha!) blades: they’ll shred your fingers from some distance if you’re not careful (you might be OK viewing via your screen. No promises). So they’ll carve the kernels off a corncob in no time at all, won’t they?
Yes, if you cook the corncob first. A raw cob will just stick, looking unpleasantly suggestive, unless you are lucky enough to catch it unawares and slash straight down before it catches its breath.
Either way, you then have to clean it. Watch your fingers.