The RBNZ put NZ into recession.
They kept the interest rates too low for too long. They also allowed banks to draw down cheap money for about a year longer than they should have. They have stated it as a goal.
Deficits are fine, so long as govt is using the borrowing to grow/expand economic capacity (inflation prevention) or a crisis (COVID). Like funding critical infrastructure, public transport, electric capacity, social housing, R&D funding etc. All this will help shrink costs for everyday people and potentially help with productivity. Funny enough, this is stuff the current govt are targeting for cuts.
Borrowing/deficits are even more critical in a recession, because we need the govt spending to help get out of the dip. What you don't do is cut funding to social services (unemployment growing) to fund tax cuts to a sector that doesn't need it. Or borrow to fund tax cuts. Tax deduction will not lower rents, because landlord costs are not what dictates rent pricing.
We still have extremely low debt. S&P have said so, and why we maintained a high AA+ credit rating post election. If we were in the shit they would have lowered the score and bond markets wouldn't want to borrow from us. But the opposite happened. Nats will change that though, by removing a chunk of money from the tax take and borrow to fund removing that money. And we'll be worse off because we have cut funding for various projects (PT, R&D, social services, social housing etc).