There's nothing like trying to answer your own post!
I've just been looking back at the release notes for the belt bonus and found the following:
For example, when you reach the Black Belt for Wheat, from that point on when you harvest wheat there will be a 36% chance of getting an extra box of Wheat.
I think, then, that it doesn't matter who harvests (you or a stranger) and you still get the bonus. (An official answer to confirm this would be good, just in case this is an example of sloppy writing.)
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