But is it a fact? No one knows. And for that reason, such speculation will become futile.
You are exactly wrong. Somebody knows. Quite a few people know.
For the sake of argument, let's pretend that the reports are true, and that the case was sealed. Under this supposition, the following people know:
1. The judge. Also, several employees of his court, such as court reporter(s), clerks, file secretaries, and similar folk.
2. The prosecutor (the one fired), the Prosecutor (who did the firing, since he found out about it), their sundry support personnel (legal aides, secretaries, file clerks, and assorted government office factotums).
3. The Police investigators who made the sting, including all the various support personnel involved in policework and sting operations, including supervisors and their support personnel.
4. Some of the family of all of the above. C'mon folks, this is just tooooo rich. You think every single one of the already considerable population who knows the facts is going to keep every detail from their husbands, wives, boy and girlfriends, and those whom it would be fun or profitable to impress with inside poop?
All that's needed is for enough time to pass to make tracking the leak difficult. Indeed, if we want to specultate on why this is coming out now, the passage of time is enough, and the occasion for delivering a humongous comeuppance, by someone who was sick to his/her guts with what happened ... well, you get the idea.
Yes, there are facts. And people aplenty know them. And someone is leaking them like a sieve.