There are studies where they compared the same vehicles that show it has reduced the numbers. They can go into the actual calculations for how they got that, if you want to see it.
You seem to be asking why you don't see this directly in the data, with a number going down. But you do realize the the number of drivers and miles driven have both increased in that timeframe, right? Such that, if the safety had remained the same, the number of incidents would have gone up. Pretty much by definition, that means a number remaining the same means something kept it from growing.
How about the number of kids playing outside? If that number goes down, that would affect the results too. Again, if those studies exist to compare results, show me.
Just googling "impact of rear view cameras on car safety" brings up the standard studies. They were modest in impact, but the cohort analysis did show results with nobody rejecting their stats.
A search for those exact words didn't being up studies for me. One of the articles on the first page even talks about the potential dangers. At this point I assume you're teolling swine multiple attempts at asking for studies on real-world data hasn't yielded nothing of value from you. Goodbye.
Apologies, I assumed you'd have to play with the terms a bit, especially with Google being personalized nowadays. For me, the first result on that search is https://www.iihs.org/research-areas/bibliography/ref/2130, which shows about a 16% reduction in backing crash rates. Which could easily conform to the numbers you were showing, as the number of licensed drivers increased by about the same percent. (I'm assuming miles driven and similar would have grown about the same.)
Reading your link appears to be more fear and caution than data showing things are worse? There is a broken link that ostensibly looks at lane assist and how it can have problems in bad weather. But nothing that says rear view cameras actively cause trouble? Just a fair callout that you shouldn't exclusively rely on them.
You seem to be asking why you don't see this directly in the data, with a number going down. But you do realize the the number of drivers and miles driven have both increased in that timeframe, right? Such that, if the safety had remained the same, the number of incidents would have gone up. Pretty much by definition, that means a number remaining the same means something kept it from growing.