How many UART ports does the Arduino UNO R4 have?

I saw in a website (given below) saying that the Arduino has two UART ports, one in the USB and one in 0 and 1 pins. But in the Arduino website, it shows only one.

https://dronebotworkshop.com/arduino-uno-r4-minima-wifi/

Also if it does have two UART ports, is it only in one of the variants or both the variants (Minima and WiFi) have them?