Earlier quoted context omitted.
A common antitrust concern is about leveraging a monopoly in one area to gain oversized advantage in another.
Yes, but that doesn't give the DOJ a free ride to use an antitrust trial in one area to punish a company in other more competitive areas by revealing trade secrets. That is extrajudicial, and not far off from a dirty cop harassing an innocent party "You may beat the rap, but you can't beat the ride" . The trial itself should not be a punishment under a half-decent justice system.
And, charity to the actual ruling, I'm assuming that better arguments were made behind closed doors to get to this point? I don't think it should be a problem to have parts of the process closed, at all. I do find it odd to have such a large blockout, though.