Just a few notes that I pulled from the ABC piece:
- still an issue which is yet to be resolved, contributes to the relevance of the piece thus attention-grabbing for public
- the structure at the beginning of the piece is reflective of the power structure for reform making (talks about Macklin, Gillard and ClubsNSW, but then goes onto say "it's not about them")
- further makes subtle criticism of the aforementioned governing bodies through details given of their attempts of persuasion within Parliament House and the Press Gallery
- obvious use of statistics for legitimacy
- the colloquial "this, frankly, is nonsense" breaks up the formality of the piece, and therefore brings attention to this statement and what it is communicating
- expert opinion from Productivity Commission
- listing of the possible consequences of problem gambling
- Charles Livingstone's credentials at bottom of article
These are just some of the things I picked up during a brief skim through. Obviously you need to decide how to structure your analysis, and that will give you some framework on where to group certain techniques together and how much detail you will go into the effect of the various writing functions.
Hope this gave you a bit of a starting point.