This may be anecdotal but I visited Christchurch NZ last year and walked around the whole city. I don’t believe I saw a single person begging / sleeping on the street.
Compared to my small rust belt city in the US where there’s homeless at every busy intersection begging and pop-up tent settlements that will frequently be destroyed by cops. Bigger cities and/or the West Coast ones like Portland have way more of this type of thing.
When you say “didn’t do a full re-wire” do you mean he left all wiring as is inside the walls and swapped 2-prong ungrounded outlets to 3-prong (which would be a bootleg ground and is illegal)
Or do you mean he ran new wire to some of the outlets and left what he couldn’t get to as 2-prong?
I’m an electrician fwiw.