Basically, the guy uses manure as a renewable fuel for his wood burning stove. No surprise there. He claims the manure bricks burn better than oak of a similar size, which I find a bit suspect, but I do know that manure does burn well.
The surprise comes from the value of the ash as a fertilizer. Apparently, it does better than the original manure. Now, I know this isn't definitive, and hardly scientific, but it is interesting.