It was not an extermination by the spanis. He does not know hostory. Yes, the Aztec empire ended, but the Aztec people did not disappear entirely; they were decimated by a combination of warfare and, most significantly, disease introduced by the Spanish. Smallpox, in particular, killed a massive portion of the population, with an estimated 5 to 8 million people perishing shortly after the Spanish arrival. A subsequent epidemic, known as cocoliztli, killed even more people, possibly up to 15 million more between 1545 and 1550.
Warfare: The Spanish conquest, led by Hernán Cortés, resulted in the fall of the Aztec capital, Tenochtitlán, in 1521. This was aided by a vast number of indigenous allies who were enemies of the Aztecs.
Smallpox: The first major blow was smallpox, an epidemic brought by the Spanish with which the Aztecs had no immunity. It killed an estimated 5 to 8 million people, severely weakening the empire's ability to fight back.
Cocoliztli epidemic: Even after smallpox, a more devastating epidemic called cocoliztli (meaning "pestilence") struck from 1545 to 1550, killing an additional 5 to 15 million people, or up to 80% of the remaining native population in the highlands of Mexico.