Why discovery of 3,000 years old ‘Lost Golden City’ in Egypt so significant? Explained

The discovery is being touted as the second most important since the tomb of Tutankhamun in 1922. Why is this discovery so significant?

source https://www.jagranjosh.com/current-affairs/why-the-discovery-of-a-3000-years-old-lost-golden-city-in-egypt-so-significant-explained-1618479801-1