Sour grapes. He's just mad because Liddy does his job better than he did.
Greenberg basically made AIG. He didn't get heaved for anything he did at AIG, he got heaved in some sort of a Spitzer witch hunt before Spitzer got heaved for being a pervert.
Spitzer got caught with his pants down, figuratively. That doesn't make him a pervert, though. The constipated Protestant prudes who make sexual behavior an issue in politics are the real perverts.
Actually Greenberg was connected with the Starr Foundation which included compensation for top executives. True that he resigned but it was because the public was outraged at the way things were handled and it was creating problems within the business.
Greenberg had a shell company in the Cayman Islands thru which profits from AIG were hidden and executives were given huge bonuses and made Greenberg a billionaire.