After a bit of research, it seems that Texcotzingo is not actually a pyramid, but rather a pre-Hispanic archaeological site located in the valley of Mexico. While there are several pyramids located in this area, such as the Pyramid of the Sun and the Pyramid of the Moon in Teotihuacan, these are not the oldest pyramids in the world.
The oldest known pyramid in the world is the Step Pyramid of Djoser in Egypt, which was built around 2600 BCE. However, it's worth noting that there were likely other pyramids that were built even earlier than this, but they may not have survived to the present day.