You are correct, and I agree with you, but it’s still incorrect to say there is no difference when research shows there is. I understand what you’re trying to go for, but stating false information won’t help to convince people.
Even if the number of cars on the road remains the same, but utes and SUVs were swapped to lower vehicles (when possible), then there would still be positive outcomes of fewer pedestrian fatalities (even if the number of accidents remains the same) and reduced carbon emissions.
Removing most cars would reduce these even more, which I assume is your desired outcome, but even just reducing the proportion of utes and SUVs would have positive effects