Not exactly. Looks like you have scattering phase, but the light model in that video has beer lambert (Out Scattering) and In scattering to give those dark edges. There are also some other techniques, but the three main ones are those.
The project I linked has a very good example this and I borrowed heavily from it to modeify CloudPost.frag to create more realistic looking clouds. I adjusted line 709 to calculate the light using all three functions.
Below is the result:
I did not add any other texture samples, just light calculations. As you can see, the edges are not blended well with the background. I changed the blend mode of cloudPost material to alphaAdditive and the result is more pleasing:
I think there is still a good amount of progress to be made, but I have happy with the results so far. If you would like to integrate what I have done into sevenSky, I would be happy to share.