That's correct, though federal law enforcement was involved perhaps earlier than that account suggests. Swartz was initially arrested by the MIT Police and a member of the Secret Service. The United States Attorney Office was in touch with JSTOR almost immediately afterwards. (http://docs.jstor.org/summary.html)

I agree with the final comment; I think the DOJ would be well-served by filing something (and that should be pretty tractable, seeing the staggering scope of apparent misdeeds) to extradite SBF as quickly as possible, and then to file amended/superseded charges in the following 12-24 months.