Super Soil

On a survivalist thread, I saw a reference to "Super Soil".  There's an e-book called "Garden Gold" that tells how to make it.  Not wanting to spend $12 at this time, I did some research online.  The only stuff I could find there to "super soil" was on a number of sites devoted to growing marijuana.

So my question is if the "super soil" on the weed growing sites would be a good starter for a garden, perhaps as the soil cover for a hugelkulture bed?

I grow things in 20% sand, 20% local soil (clay, in my case), 20% vermicompost, 30% aged compost, and 10% crushed biochar

Those percentages are by volume.