They do grease it. It's just that you cannot put much grease in there at all or it will fling out and contaminate the clutch pucks.
With regular maintenance, you should clean the pucks with brake cleaner or lacquer thinner as any grease in there will eventually fling out regardless.
FWIW, you can get by without all of this maintenance, as do alot of folks, but the lifespan of the clutch assembly will be greatly reduced.
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