I think you've asked some great questions and wanted to respond to the rest of your post here - it could be that he's confessed of his own accord, and that he is guilty. OR. It could be a number of things:
"Another major factor in false confessions is “contamination.” Showing crime scene photos or sharing other evidence is a typical way police contaminate a person’s story, prompting them to incorporate facts about a crime of which they otherwise have no knowledge.(((James Trainum,
How the Police Generate False Confessions – An Inside Look at the Interrogation Room, Rowan & Littlefield (2016), pp. 133-35.))) It is how innocent people with no knowledge of a crime learn what happened: police can unintentionally (or intentionally) leak information to the suspect when trying to convince them of the strength of the “evidence” against them." --
Ending false confessions is a moral imperative that requires action from police and all the stakeholders in the criminal legal system.
theappeal.org
This is what I want more information about before I deem his "confessions" as signs of his guilt. We do not know what questions he was asked by LE. We don't know if they showed him photos of the scene, or if they lied outright to him in their statements to him. We don't know if they told him the court would go easier on him if he confessed at all, or to someone in particular. We don't know what he said, or when. We don't know if he was in sight of the guards when he made those statements or if the man was intimidated somehow into thinking that Odinists might get him or his loved ones if he didn't confess. We just don't know. What we DO know, from other cases, and from any small amount of research online is that false confessions can and do happen, seemingly more commonly than even I had previously thought. That link I posted shows clearly some of the tactics used by investigators to get a "confession". Did they employ those techniques in this case? I don't know yet. I'd like the state to prove their case - that this is the man who kidnapped and killed those girls that day, beyond a reasonable doubt before I convict him in my own mind. Right now, I'm afraid I don't trust the LE, the state or even the defence team one bit.