That sentence is partially true with the purpose of misleading anyone who reads it.
The FBI NIPC referenced in that sentence was transferred to the Department of Homeland Security in 2003. Generally speaking, InfraGard was "tasked" to provide such analysis after 9/11/2001. Their role after 2003 is still being defined and coordinated by FBI Special Agent Coordinators at each local chapter.
Membership in InfraGard is by local chapter. In this case, Arizona. There are several InfraGard chapters in Arizona. None of them issued this document.
Dr. Rapacki authored this document on his own. He referenced his membership in InfraGard as a means to associate the document with the FBI, which is disingenuous. Whoever wrote that first sentence of this story did so with the purpose of hijacking the stated purpose and goal of the InfraGard organization to lend credibility to this white paper.