Yeah that's true gun culture and availability are very different. I still don't see why there has to be 225 cops for every 100,000 residents. It reminds me of dairy lobbyists saying we should consume way more milk than most people can tolerate. Toronto's crime situation might not be perfect, but I've seen no evidence that it's any worse than most major cities in the US. Dallas, for example.
Dallas has 226 cops per 100k residents (so it meets this arbitrary standard) with 778 violent crimes per 100k people. That's a higher violent crime rate than Toronto. Maybe it's the guns, but Austin has guns too yet way fewer violent crimes per 100k people. All the same incentives for "under reporting" the violent crime rate in Austin are present for Dallas and Houston, where the violent crime rates are much higher despite having more police per capita than Austin.
Austin might have the right amount of cops, or it might have too many. But they are definitely overpaid and we definitely do not need more of them.