No, the NIAA doesn't spend $30b a year on Indigenous programs, page-8

I stand by my calculation.

Right after your quote explains the breakdown.

The vast majority of that ($27.4 billion) was simply the Indigenous share of "mainstream expenditure" — that is, expenditure "provided for all people", including spending on schools, hospitals, welfare, defence and "public order and safety".

The remainder ($6 billion) was spent on "services and programs … provided to the Aboriginal and Torres Strait Islander community specifically".