My thing is this, he is faking his Autism, why?
He was diagnosed while in custody after having been caught for the murders. After lockdown, the spike in Autism and ADHD content online, to Reddit and TikTok especially, it wouldn't surprise me if he RESEARCHED traits, how many things you need to check off to get a legal diagnosis, and what it actually looks like. The guy was found to have a friggin' final exam paper on crime scene forensics, like come on, he was thinking ahead, using it as a way to avoid the death penalty when getting caught, similar to like when John Wayne Gacy tried to get an insanity plea and use it to get out from going to prison and then they later found out he was faking it all and just manipulating the court during his trial.
If he had been diagnosed long before this all happened, then yes, I would easily believe he was (I have a non-verbal cousin with Autism whose the same age as Brian!), but because of the TIMING of it and the fact he was evaluated while waiting for a trial, I'm telling you he is faking it as a way for people to have sympathy for him, all an act of manipulation so people would take his side and demand him to be set free or to go lighter on him.
As what a psychology published in an article on Psychopaths being criminals:
"The 2012 FBI report states that the unique ability of psychopathic criminals to manipulate law enforcement authorities poses legitimate challenges for the criminal justice system. During interrogations, psychopaths are not sensitive to altruistic interview themes such as sympathy for their victims or remorse for their criminal acts.
As a result of their arrogance and illusions of invulnerability, they are more likely than non-psychopaths to deny charges brought against them by authorities. According to the FBI, there is also evidence that psychopaths are able to influence the system to either receive reduced sentences or appeal their sentences to a higher court.
This is likely due to the fact that psychopaths are extremely meticulous, compulsive and relentless by nature which helps them to coerce criminal justice practitioners. Moreover, psychopaths are very adept at imitating emotions such as remorse or guilt in the courtroom if they believe it will mitigate their punishment."