Please check your PWM data in the article once again. It seems you've mistaken the refresh rate (60Hz) with the PWM (480Hz) in one sentence. This is a very important information and notebookcheck is widely considered a valid source of PWM rates information. But here in this aticle the information on PWM is definately misleading.
Not only does the iPhone 15 Plus offer a large display, but it also gets the Dynamic Island for the first time this year. In addition, there is a higher resolution main camera, a slightly more powerful battery, more computing power, and USB-C. All that, Apple tops with a slightly lower price than last year.