Why was Jason Giambi Summoned to the Commissioner's Office?

NY Yankee slugger Jason Giambi was summoned to the baseball commissioner's office seemingly because he offended baseball with these remarks:

“I was wrong for doing that stuff. What we should have done a long time ago was stand up- players, ownership, everybody- and said, ‘We made a mistake.’”

However, this is old news. Giambi, after all, testified in late 2004 at the BALCO grand jury that he used steroids and human growth hormone. Could it be that the commissioner's office is embarrassed that a player can say what it has been afraid to? Just because Giambi feels guilty (a suspected brain tumor a few years ago will do that to you) doesn't mean he's a boy scout. Still, the commissioner's office is picking on him because he effectively fingered it for winking at the steroid problem previously.