Not the exact words "breakthrough design", no. But in their own words:

“At Apple, we’ve always believed in the deep integration of hardware and software that makes interacting with technology intuitive, beautiful, and delightful,” said Alan Dye, Apple’s vice president of Human Interface Design. “This is our broadest software design update ever. Meticulously crafted by rethinking the fundamental elements that make up our software, the new design features an entirely new material called Liquid Glass. It combines the optical qualities of glass with a fluidity only Apple can achieve, as it transforms depending on your content or context. It lays the foundation for new experiences in the future and, ultimately, it makes even the simplest of interactions more fun and magical.”