This image was one of a number of instances of Youssef Uweinat, 23, intentionally advocating the commission of terrorist offences.

In the NSW Supreme Court earlier this month, Justice Geoffrey Bellew jailed Uweinat for three years and 11 months for that offence and for being a member of a terrorist organisation.

Justice Bellew imposed a non-parole period of two years and 11 months.

An agreed statement of facts, tendered in court, shows Uweinat used social media and encrypted services to distribute Islamic State propaganda to other people, including children, in 2019.

The Sydney man created some of this material himself.

He involved at least one young child in videos glorifying the extremist group, later admitting in court this was "stupid" and saying he regretted having been prepared to indoctrinate youngsters.

During the period of his offending, he was in contact with Isaac El Matari, the self-declared Australian commander of Islamic State.

They met in June 2019, less than two months before the photograph taken of Uweinat in Ainslie was saved to another person's device.

The image, taken on a street corner, depicts Uweinat standing in a ute and displaying the finger of Tawheed, which Justice Bellew described as "a gesture which is an integral part of IS symbology".

"The IS flag was overlayed [sic] on the image, so as to appear as if it was painted on the side of the vehicle," the agreed facts state.

"Overlayed [sic] on the image was a graphic with the word 'Canberra', depicting Parliament House flying a black flag, and the words 'ready to take over or become green birds'."

During cross-examination in his sentence proceedings, Uweinat admitted he had created this image.

He agreed with the proposition that the reference to green birds related to "the idea of being involved in a martyrdom exercise".

He was then pressed on whether the Ainslie image "clearly communicates that this was a martyrdom exercise that could occur in Australia, in Canberra".

Uweinat replied: "Yes."

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The offender told the court he had now renounced his membership of Islamic State, adding that everything he had said during the course of his offending was "false and wrong".

He claimed he had changed his views because he had "done [his] own research instead of just blindly following people" like he had at the time of his crimes.

Justice Bellew ultimately described Islamic State as "one of the world's deadliest and most active terrorist organisations".

The mere membership of such a group, he found, was a serious matter.

He said Uweinat's decision to involve children in his crimes made the offences particularly serious, saying the man's belief this was stupid "tends to grossly understate its significance".

The judge also detailed how Uweinat claimed, despite having pleaded guilty to both charges, that he had never supported terror attacks on Australian soil.

Justice Bellew said Uweinat had merely conceded that he had been prepared to create an image that would give that impression.

The offender also used a social media platform to send an image of Sydney Town Hall with a black and white flag on the top, while he saved and edited a picture that showed the Islamic State flag on a tower of the harbour city's Anzac Bridge.

"I am also unable to accept his assertion that he never supported terrorist acts in Australia," the judge said.

"The evidence generally, and his references to Australian landmarks specifically, is overwhelmingly to the contrary."

With time already served, Uweinat will become eligible for parole in November next year.

His current whereabouts are unknown, but material tendered in court shows he was being housed during his time on remand at the notorious Goulburn Supermax.

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