I'll try to look into this issue further over the next day or so if nobody else gets to it sooner. It seems possible that LBC attached to a video isn't directly associated with the video owner's personal LBC wallet, doesn't it? And that LBRY has some internal site process that deposits the coin into the wallet when it's cashed out, meaning it won't appear in his balance sheet until then, even if it's technically "his" via being associated with a piece of his content?
Their end-user documentation refers to individual users having account balances, plural, so it's possible, though I can't determine in detail how any of it works just from this cursory overview:
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In any case, we'll get to the bottom of this sooner or later, since LBRY does not directly redeem your coin - you must use an exchange to convert it to fiat. There are
very few exchanges that allow you to cash LBC out into fiat (Bittrex is the only one I'd heard of before, and is also the one LBRY explicitly recommends, but there are a few other):
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As such, if he wants to actually get paid, he's going to have to withdraw his coin and then initiate an outbound transaction to deposit the coin into his exchange wallet and we'll be able to see it happen, so the funds will show themselves in association with either his personal wallet or another single wallet we can deduce is his exchange wallet sooner or later if they're real.