If you read the title at the top of the page at the link you provides, you'll see it's "Providing material support to terrorists." Manning has not been charged with terrorism.
The subheadings are not part of the law and are there for general information only. If you read the specifics of the law, as I said in my comment just above, the law covers giving money in support of a wide variety of crimes, not just KABOOM! terrorism, despite the title. The wide variety includes computer crimes.