The 18-year-old, who cannot be named for legal reasons, was sentenced on Thursday after pleading guilty to counter-terrorism offences including publishing extremist material and using a carriage service to make a threat to kill.
Police arrested the teen in May 2025, after he sent an email under the name Adolf Hitler to the Melbourne Hebrew Congregation, claiming a shooter would attack the synagogue during Shabbat.
He was also charged after posting an IS promotional video to Instagram, depicting several captives being executed, as well as photos of himself holding knives and machetes.
Supported by his parents, the 18-year-old was led into a courtroom on Thursday, where he smiled and waved.
The teenager's defence lawyer told the court his client had a long road ahead and his prospect of rehabilitation was positive.
"There is also a reflection the impact of that custody has had. It is not controversial that he has found it harder than a person of average health," he said.
A children's court magistrate handed the teen a 12-month supervision order with strict conditions including the weekly appointments with a forensic psychologist, and no access to the internet, unless supervised.
He was also banned from contacting or attending within 200m of the Melbourne Hebrew Congregation synagogue, along with purchasing weapons.
The magistrate said the order was the highest punishment the court could impose outside of detention.
"It is not in dispute that he should be released," the magistrate said, noting that the teenager had already spent 357 days on remand.
"Only so much can be done here, nothing is going to be perfect."
In handing down the sentence, the magistrate noted the teen lived with complex diagnoses, including autism, oppositional defiant disorder, ADHD and borderline cognitive functioning.
The teen was previously charged by counter-terrorism police for separate offences in 2021 but the case was ultimately stayed in 2023 after a magistrate found officers had acted inappropriately.
Outside court, his parents told reporters they intended to launch legal proceedings against the Australian Federal Police, alleging the agency discriminated against their son's age and disability during the 2021 investigation.
"We have suffered," the parents said.
The 18-year-old will return to court for judicial monitoring in May.
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