Why is the New Tang Dynasty that borrowed troops from the New Tang Dynasty called the New Tang Dynasty?

In order to revitalize the Tang Dynasty. According to the plot introduction of the TV series "Heroes of Sui and Tang Dynasties", Xintang is a place name in the TV series. It was built at the end of the Tang Dynasty. The reason for its name was to revitalize the Tang Dynasty and build a new Tang Dynasty. The storyline of borrowing troops from the New Tang Dynasty comes from the TV series "Heroes of Sui and Tang Dynasties".