What does Si Nuo mean by calling it Elvis Presley?

Si Nuo is the economic, financial and cultural center, and also the city that likes cats best, with an urban area of 5,343 square kilometers. It is the most densely populated city in Si Nuo and one of the most populous cities in the world, but the love for cats here has reached an almost crazy level, and cats can be found in almost every corner of Si Nuo.