Interesting. Where/how did you come across it? And what is the generic term for this kind of process (just wondering so that I can look it up on Wikipedia!)

See:
biofrack.com/

Basically it is a method to crack open compacted soils and deposit biochar into it. Thus it does carbon capture, probably has longer term benefits for soils and could solve some issues with low permeability soils for water based sanitation systems.

The technology seems sufficiently simple to be applied widely