In reality, it's very hard to measure consensus. Where this guy went wrong is trying to measure it rather than just being part of consensus.
He looks really young, there's a pic of him on there and he looks to be on his 20's, so I don't see how he is rich, unless his parents are really rich and he is gambling with his parent's moneys, for 99% of 20 year olds $85000 is a lot of money.
It was always a bad bet. If 2x won I would be done with bitcoin and most people would too. If an contentious hard work wins you would be holding a shitcoin so if you made some $ gains better dump it quickly, fortunately they didn't get away with it once again. Everytime people lose money on these fork-bets bitcoin show's his strength by making real BTC holders richer and contentious-hardfork supporters poorer.