Luigi hasn't denied it, but the guy who published it got a copy of the handwritten pages. That could only have come from the police, and the police made no effort to determine where the leak came from.

Leaks like this shouldn't happen. It's prejudicial and contaminates the evidence. If he was actually guilty, and we had a functioning justice system, this would ostensibly weaken the case against him. But we don't have a functioning justice system, and all signs point to Luigi being railroaded.