They will have missed Monaco, as they only looked at the 150 most populated cities. When I was there around the millennium it was the clear leader in police officers per head of population, so I expect it’s also doing well on cameras.
This is the source for their chart. [1] It claims that NYC has a mere 31,490 cameras. As anyone who's ever been in NYC will tell you, that is complete and utter nonsense.
[1] https://docs.google.com/spreadsheets/d/1I-WpH2KOiguKy9JTQ9zC...