The IV stuff is new. A lot of the other points (like the 3 positive tests that were swept under the rug) have already been brought up over the years by other writers, but Hauser does a good job of bringing all the info together, and his rep as a well-known writer gives it a bigger platform.
I don't really care about PEDs in sports, and this article doesn't definitively prove anything. However, Hauser does raise a bunch of suspicions that I've assumed for a few years, mainly that Floyd's claim of being some kind of anti-PED crusader is a complete farce, that he's in bed with officials that give him special treatment or look the other way, and that his career is every bit as suspicious as those he's accused of being dirty, like Pacquiao.
When Pacquiao was refused a shot of Toradol before the fight, my first thought was "Wow, Floyd never would've taken No for an answer if he had been the one needing the shot." Now it appears he himself was caught in violation of the pre-fight testing protocols on the night before the bout, but no one was notified and the drug testers retroactively granted him an exception 20 days AFTER the fight.
And remember, the supposed reason that we didn't get the fight 5 years ago at its peak was that Floyd claimed he needed to be sure there was a level playing field. Brilliant boxer, great boxing IQ, and also a complete con man and manipulator.