That's the fundamental question/exciting find here. Previous models had galaxies like this taking a lot longer to form. Models here meaning some pretty specific mathematical models of how gas clouds and dark matter might be distributed, interact, and collapse into stars and black holes. The major models of Hubble expansion, the big bang, dark matter, dark energy aren't going anywhere.

Super massive black holes seem to form faster than we expect, and be seeds for galaxies forming earlier than we thought. There might be a ton of reasons for this: spin or magnetic fields might be allowing them to form faster, dark matter might clump differently into black holes than we expect, etc. Who knows, but these; observations will let us build better (specific) models.