I bet they have a deal with uBlox so that people prototyping with this board will use uBlox for final mass produced design. In general you use module instead

I bet they have a deal with uBlox so that people prototyping with this board will use uBlox for final mass produced design. In general you use module instead of chip to save on certification. However for ESP32 the logical choice would be indeed a module from Espressif.