Heilberg wanted the autism disposition, but there's no sign Chris has gotten it yet. The August review might end with "Not eligible for autism disposition, back to real court"
There's a lot of mitigating circumstances around the "autism defense", for example, Chris could larp as whomever he wants, but the minute he lets something slip like how he understood it was wrong, it's going to go out the window. If Chris acts high functioning, can get along fine, understands the proceedings, then it's not going to go well for him. Now what is really going to bite Chris, is statements he's made about what happened, at that time. If he lets slip things like "I knew it was wrong", or "She told me to stop but needed me to give that extra nudge", those are going to get him in hot water.
The letters won't be any more proof of what Chris did than the phone call confession, or forensic evidence or any interrogation footage, BUT it would matter in terms of sentencing or probation. Imagine this
I really believe that Chris spilled his guts, either the same level of detail or even more detail when he was being interrogated by the police. At that time, Chris was high on life during his arrest, and seemed pretty happy. Those are the times Chris can't keep his mouth shut.
Chris is also a simpleton, he doesn't understand basic interrogation tactics, so he could have spilled the beans in detail without even knowing it was going to be used against him (or he forgot his Miranda right, or didn't care).
If Heilberg's threatening people, Consolvo probably brought these letters up in court already
This could be the case. It could also be that Heilberg knows Chris can't shutup because of all the damage he did to his case already and knows he can't stop Chris from writing whatever he wants, so his only recourse is to threaten legal action if Chris blurts out something that will hurt his case and doesn't want it online.
Of course, Heilberg seems to be operating on that Chris has a huge following, and might even believe Chris when he says that trolls made him do all these things since that's Chris's go to excuse for anything bad that's happened in his life, without knowing specifics.