Is he complaining, or bragging?
He was trying to discredit Woodward when he thought Woodward would hurt Hillary's reputation.
It's true that Woodward has a lot of connections in the government.
And I guess the idea is that the FBI feeds him the information (real or concocted) that it wants to get out.
But most of his books haven't had much to do with the FBI, so the FBI connection may not be the most relevant thing about this book or any of his other reporting.