The guy who won that house is a young guy (in 30s), and does not seem like a flipper. He didn’t join the bidding until the very last stage, from around $540K. I think he could just be a consumer for the house.
Actually, I would disagree with you. This is how you bid on auctions if you don’t want to drive the price up. You wait until bidding slows down and if the price is still under your max, place a bid.. higher enough above what the last bids were to make people pause.. but not at your peak bid.. unless the price is very close to your peak.