Searching the article which is linked to and which you are commenting about reveals that it does not even include the term "FBI". However that is hardly relevant given then connection to the FBI that the JTTF has, members are generally acting on behalf of FBI investigations when they do JTTF work. If someone were to call them de facto FBI agents it would not be inaccurate given they act with the authority of the FBI and are paid by the FBI for their work on the JTTF.
Please state clearly whether you are asserting that Ms Catalano's article here contains lies in your opinion, and clarify exactly what she said that you believe she is lying about or misrepresenting. Please provide a reference quote to the part of the referenced article that you are commenting on where she makes a claim to be visited by FBI agents specifically and not the JTTF.