The gag order does not prohibit them from discussing evidence in court filings. Look at all the salacious and controversial stuff packed into the many Frank's motions.
And what about all the motions to suppress , where they listed all of the reasons the charges to be dropped?
Wouldn't this 'bombshell' be a big reason that should have been listed? It would not be against the gag order.
If this ends up being a red herring it will really hurt the D's credibility with everyone, including the jurors. IMO