The original paper would be: https://onlinelibrary.wiley.com/doi/10.1111/add.16648

The part the article OP linked to would be based off the line:

  To put these percentage changes in terms of interest to policy makers, a 10% decrease in gambling expenditure in NSW would result in 4579 fewer ASS offences; 2867 fewer BESD offences; 1380 fewer BESND offences; 1398 fewer MVT offences; 2361 fewer SFMV offences; and 3793 fewer FRD offences 2 each year