That manifesto screams mental illness (if it's legit written by him). He describes himself as a "full time kebab removalist".
You see his face in the video and that's how he was identified.
I'd say this guy is as much terrorist, as Man Monis. More deranged lunatic than actual full blown terror attack.
I don't believe he had any intention of getting himself killed in this.
Not only that but the way he handled the weapons, clearly he is comfortable around them. There was no shaking, no fear, no nothing. Completely calm and focussed on killing and confirmed killing as many as he could.
In his car in the video he had several gerry cans of fuel.