It’s there in black and white on the page I just gave you a link to.
“Assault team that ended the 16hr #SydneySiege are commandos from Tactical Assault Group”
As for my other sources, I can’t link personal conversations and unless you’re ex- or serving ADF, you almost certainly won’t have access to the other place I’m discussing this online and frankly I wouldn’t want to invite you to that forum.
If it is a forum you can link to it.
Would you please link to the article that you are using?
All you did was show a twitter sentence dated the 15th.
Tell me the forum so that I can look at it, my military experience may be useful on it.