a bioarchaeologist and University of Miami referred to it as a city.
https://www.miamicondoinvestments.com/miami-news/significant-archaeological-find-in-miami-from-a-7000-year-old-settlement-at-new-construction-site
Here's a more detailed article.
The newly uncovered evidence, Pestle and other independent archaeologists say, suggests that the Related site was occupied by a succession of indigenous people starting in whats known as the Archaic period. For 2,000 years or so until the arrival of the Spanish in the 16th century, it was home to the Tequesta tribe that is likely responsible for the Miami Circle, today a state park at the mouth of the river.
The finds also demonstrate that the Tequesta village on the river, the tribes principal settlement, was far more extensive than previously believed, they say. Spanish accounts put the settlement only on the rivers north bank. But the finds at the Related site, just steps from the Miami Circle, indicate that at its peak hundreds of years ago the Tequesta town spread along both banks of the river.
It may have been home to perhaps 6,000 people, though no one has yet attempted a formal estimate, said Traci Ardren, an anthropologist and archaeologist at UM who is an expert on New World prehistoric cultures.
https://www.nny360.com/news/prehistoric-tools-ancient-relics-unearthed-on-the-miami-river/article_0a80cff3-d0dc-5835-8b57-78fde9b88a2e.html#:~:text=People%20are%20seen%20working%20an,the%20Tequesta%20Native%20American%20tribe.