That is completely wrong and is because you don't understand how the process works. The ITC is a US federal agency under the executive branch of government which has the right to issue certain orders on behalf of the federal government. However, the party affected by the ITC order [or any US agency order] has a right to have the order reviewed by a federal court if the party thinks the order is incorrect. Since Apple is challenging the validity of the underlaying patents, it clearly disagrees with the ITC order and as is its right is challenging the order in federal court.How can a US court overrule an ITC decision? If that is possible, any court in any country could do that.
The federal court has the right to overturn the ITC either temporary or permanently.