The goal is for Model Y production to start at the selected location by the end of 2020. If this happens then the factory would go from start to production even faster than the Shanghai Gigafactory.
The factory will eventually produce Cybertrucks and Model Y.
They will likely start with general assembly and then add painting, stamping and Build it in White Robots.
In the David Lee video he says 2020 at times when he means 2021. In 2021, they will add more to the new factory.