Right. The person in question plead guilty to criminal tax evasion, an exceedingly rare charge. Nobody gets charged with tax evasion for reasonable but incorrect interpretations of the tax code. In this case the evasion was intentional, flagrant, and large.
I still think something is missing from the story. They state the scheme was designed by outside legal counsel. Lawyers are paid to know the law. Under federal law, for it to be criminal tax evasion, the conduct has to be willful. Doing something with advice of legal counsel is almost definitely not a willful violation of the law.
The reason for this apparent paradox is that all of the key statements in this blog post are false. Just go read the US Attorney's press releases or the perpetrator's guilty plea if you want facts.
