These images all reenforce only one thing - that Reuben Wu is a fantastic photographer. For him the iPhone is just a tool, much as a knife for a chef or a keyboard & monitor for a developer.
You're not wrong but on the other hand, if the knife can't cut, that will hamper the chef.
Also Wu had this to say, “The iPhone 15 Pro is the best camera available for its size, and while it can’t replace bigger dedicated systems, it can create images which still push my own artistic vision and display them at gallery quality and sizes, and I was shocked how good the prints were.”
Only one thing? Not so fast young cowboy. They also show that the phone is capable and even if a Huawei or whatever has a better camera, it is possible to create fantastic photographs.
While I agree with what you say and it's a worthwhile point to make, it's still notable when a tool can be used in such a way by an artist. Wu could have taken amazing photos with an iPhone 1, but he (most likely) couldn't have taken these specific images due to resolution and exposure performance/control differences.