Yup. I had an iPhone 6S that was affected by this. When the battery was starting to get older, things like opening the camera would sometimes just cause the phone to die. I got the battery replaced for free, but flipping it to throttle instead of randomly shut itself down was an improvement, and likely extended the usable lives of the affected phones, not artificially shorten them. It shouldn’t have been done secretly but it wasn’t a conspiracy to sell more iPhones.