Having just looked into this product, My findings are it is not all bacterial.
I checked out the Agricultural labeled product
What it does contain:
Endomycorrhizae, Ectomycorrhizae, Trichoderma spp, Beneficial Nematodes, Protozoa. The mycorrhizae include a fairly broad species set. This would be a good starting point for both direct addition and addition to your compost heap.
the rest is all nutrients.
If I didn't have the ability to grow all of these myself, I would buy a trial size of this product and test it in a garden bed.