I can't envision how it work...video, I need a video.
When you go around a corner the outside wheel has a longer distance to run. The spider gear connected to that wheel's sideshaft wil turn 3x faster than the gear connected to the opposite wheel. The two plates is pressed apart by the springs and rest against inside of the two large gears of the spider gearset. The gears will turn at same speed in oposite directions. Friction between the gears and plates brake the spider gears action. It is the same way an LS diff work, with the difference then you have friction material that rubs on each other.
As was said the parts will eat into each other. From my experience the soft steel will eat the hard one (the gear). How good the action will be is hard to say, steel trying to seize on another piece of steel with lots of oil in the mix?? It is possible that the shavings is microns thick, like the bits off a bike clutch, that also mix in the common engine/gearbox oil. only not steel. I will easily try that in a drag or race car that is not used on the road, meaning limited distance driving. But I am a stingy pensioner.
I know of a VW tuner that tighten the spider gears, in drag cars, in a way that there is interference between the spider gears and thus not easily turning. Another example of not so clever engineering that may work short term. That said Torsen does the same in another way............