They are all absolutely on something... Not necessarily illegal or prohibited but they all use any advantage they can squeeze with out getting into trouble. Some live at altitude, some take drugs, some use blood, some use altitude tents, some train at insane schedules. Their world is too competitive to believe any one of them is there on raw talent.
As for the firing… You can be right and at odds with self-preservation at the same time. He should be admired by us for his revelations but should be fired for violating his contract. If we, the fans, cry injustice loud enough someone will hire him for his talent without regard for his (apparently) popular but controversial blogs.