The two explanations you linked are the same, and it seems a perfectly reasonable one to me.
Of course, since there are more than 1000 phones in the world, I don't see why anybody would think the last 3 digits of a phone number somehow uniquely identified the phone in the first place...
(eta) If the users set up Facebook accounts soon enough to have a 3-digit ID number, the chances are that some of them would be test accounts or ones that aren't otherwise used any more.
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