Arduino to firebase via serial communication?

[xxrw]

I'm working on an Arduino + app project, and want to send sensor data to firebase, however, I'm on a bit of a time crunch so I'm not sure if I'll be able to get a ESP8266/other wifi module in time. I've heard there is a way to send data to firebase via serial communication (when the Arduino is physically connected to a computer) that doesn't require a wifi module--is this true?

I saw this tutorial here How to connect arduino to a database in this tutorial using firebase without using any Wi-Fi chip - Muhammad Lokman but I'm still not entirely sure on how to go about this. So, if this is a feasible approach does anyone have a more specific tutorial guidance?
Any help would be much appreciated!

[docdoc]

@xxrw

I'm still not entirely sure on how to go about this

The linked page seems clear enough to me. A Python script receives the data from Arduino via serial (USB/COM port) and does all the work on firebase side. So what you need is to know Python enough to change Python code to operate on your firebase with your data.