Well, I guess it’s better than just showing up to court and shrugging your shoulders, but this argument doesn’t persuade me.
The prosecutors from U.S. Attorney Patrick Fitzgerald's office on Sept. 18 filed a motion for reconsideration in the case, telling U.S. District Judge Joan Lefkow that the government witness who she determined gave false testimony at the trial actually "was truthful, but inaccurate." When taking into account additional evidence not cited in Lefkow's decision and viewing the case as a whole, no finding of misconduct is justified, the prosecutors argued.
Source: Law.com - Prosecutors Defend False Testimony as 'Truthful, but Inaccurate'