I looked it up and it was in 2022. Apparently it was misreported. The study investigated how advertising for colonoscopies as part of public health programs was effective or not. And it turned out it’s not effective at all. It did not look for how effective the colonoscopies themselves are. I just read this summary:

https://www.statnews.com/2022/10/14/colonoscopy-study-experts-discuss-furor-nuances/