It seems the FBI gave him a break, and were not going to arrest him, so he will face less time. The FBI would not arrest him after being told he made the threats, so the prosecutor he worked for did, leading to him facing 5 years instead of 20.

From today's Gangland by Gerry Capeci
In arguing for Borrello's detention, Gerdes noted that he faced a maximum of five years behind bars for his serious violation of supervised release (VOSR.) She noted that the same allegations would carry a prison term of up to 20 years if Borrello had been arrested on a criminal complaint by FBI agents who had been contacted about the threats, instead of being charged with a VOSR.