Not op but “designed” isn’t binary. If a design starts out in CA but is half-baked when it gets tossed over to China and so requires Chinese engineers to make changes to make it real… who really designed it?
Having worked at Apple for a number of years that’s not how it works. It’s much more like an architect/builder relationship where Apple is supplying detailed construction and interior design plans as well as overseeing the overall execution.
My point was more in general. Should’ve clarified that.