The pull quote "The attempt by these gamblers to pressure me to change my reporting so that they would win their bet did not and will not succeed. But I do worry that other journalists may not be as ethical if they are promised some of the winnings" misses something. If the reporter changes his story, then the people on the other side of the bet might start harassing him. OTOH individual betters anger will depend which side of the odds they're on.
Also that journalists are paid for their work, often by someone with political interests, so they are already subject to pressure to modify their reporting. Hopefully not usually threats of violence though!