Well, I only watched the stills, now I watched the animated version, and indeed , you can just animate the evolution to get what they did.
You also might want to fine-tune the brightness & contrast settings of the fractal noise to get another balance, fe. contrast 200%, brightness -50 also give snice results etc.
All this being said, it looks to me like everything Layerlab are selling is just based on different fractal noise settings, I hope I didn’t put them out of business by recreating one effect here in about 5 minutes time 😉