What do you mean that everybody lost their referrals? Do you mean the "Shared" column? If so, this represents the amount referrers shared with their referees. It's possible that the guy ran some incentive where he promised to share a portion of his earnings with whoever signs up through his referral link. We had some schemes of this sort on this forum in the past. Or it could be that he self-referred his own alternative accounts, but not sure what would be the point of sharing the rewards then.

I would imagine all the top affiliates have earned most of their profit long years ago, when Bitcoin was dirt cheap. I don't think this would be achievable nowadays. I think when this site was created, Bitcoin was trading for below $200. This should put things in perspective.