Earlier quoted context omitted.
did you read it all? it claims the prices are higher due to the hidden tax and that amazon is price fixing by threatening to block 3rd party sellers if they sell at a more reasonable price elsewhere. this doesnt necessarily mean that consumers will get a better deal elsewhere but it is probably unhealthy to put all that price setting behaviour in the hands of one company.
That doesn't really sound like price setting power. They are saying you can set whatever price you want, but it has to be the same as other sales channels.
Thats the issue.