Ben Weiser of the New York Times has details, here. The judge pointed out that if there was injustice in the terrorist’s conviction on only one of the 285 counts, the victims are the United States and the hundreds killed and maimed in the embassy bombings.
update: I should have made clear that this was not the appeal of Ghailani’s conviction — he hasn’t even been sentenced yet. The defense lawyers had argued that the trial judge should throw out the lone conviction based on the 284 acquittals. It is that “post-trial motion” that was denied here, by District Judge Lewis Kaplan. The appeal will not take place until after sentence is imposed — sentencing will be very soon, but the appeal will probably take many months to be resolved.