He suspended pensions contributions, took just over $8bn in state aid funding and exemptions from state regulations, and delayed initiatives such as classroom size reduction. The city also over-estimated the number of employees it would have this year so that was an extra special saving of $1.3bn when expected outgoings were reconciled with the actual number. The actual tax increases he has implemented would “only” be worth $500m.
Basically it was a one-time thing, and the budget won’t be balanced next year, and the tax increases are nowhere near enough. But it got good press for a couple of days which I suspect was the point.