Oh, yes. But in 2015, Montgomery sued Risen, and that's when he dumped his "evidence" on the FBI.
The newly revealed text was written in March 2017; Montgomery and Klayman sued the FBI, etc., in June 2017.
In March 2017, however, Corsi was touting Mongomery's data, and of course Zullo, Gallups, Rondeau, etc., breathlessly hashed and rehashed everything. (And, ob., Klayman used this "evidence" to justify yet another filing in his suit against the NSA, which was still barely breathing back then). So the March text may have in response to the slight spike in interest in Montgomery.