The only plausible situation I can see is that he or one of his employees was purchasing consumables used as part of the repair business using the affiliate accounts. More likely is that at some point in the past 7 years someone Amazon associates with his account made a purchase using an affiliate link and they used that as the excuse.
Oh you're right I'm sorry, this is not the video I thought it was. I thought it was the video from a few days ago when he was talking about what happened to Brandon Jackson!