Tygart's blatant lie indicates corruption from the top down. We already know some athletes are protected and others can negotiate a plea deal to get off with a less severe or no punishment.
For example, Shacarri only had to miss the Olympics instead of 4 years with a stipulation of "marijuana" to also further protect her and her future monetary earnings. The cover up ended up making her richer but also notably helped USATF as they know too many high profiles positives would additionally kill their own income.