This is being left public for those who followed the tutorial and want the files I mentioned in that video.
The fire in Scribble Gen isn't the same method as this one, but it is much more versatile and easy to customize
These won't work in other programs, make sure you are using Blender.
The idea is that a shader based fire animation will render quickly and doesn't require any physics simulations, making it an especially good solution for background elements.
To see a demo of how these work, watch this video:
https://youtu.be/bsOVx1TXnNs
If you'd like to learn how to make this yourself, here is a tutorial:
https://youtu.be/q6deuB-bGvg