Looks like they put GFO into an organic carbon dosing pellet, although it might be some other phosphate binder. If true, I can't imagine why one would want to do that, and I wouldn't use it. Where do they think the GFO ends up?
Reading the write up I found, it doesn't make me want to use it.
http://www.aquariumspecialty.com/blog/all-in-one-biopellets/
What makes the All-in-One BioPellets different from the standard pellets? In a nutshell, they have combined the NP Reducing BioPellets with the active ingredient of phosphate remover. Since any organism needs phosphates as a building block to allow growth, including bacteria, this combination produces a winning result. As with the standard NP Reducing BioPellets and the NP Reducing BioPellets XL, the bacteria consumes the pellets for the carbon in order to multiply. At the same time, the bacteria consume the nitrates and some phosphates from your water column resulting in lower nitrate levels in your water.
It was being reported by some aquarists that the NP Reducing Biopellets did not function properly in their tanks. This was found to be mainly due to heavy phosphate removal from the water. As previously stated, any organism, including bacteria, needs phosphates to allow for growth and reproduction. The new All-in-One BioPellets have the phosphate remover built in allowing the bacteria to utilize it for growth and reproduction at the same place as their carbon source. This combination improves nitrate removal by about 5x. As the bacteria consume the pellets, a new layer of "fresh" phosphate remover will be exposed for phosphate removal. This makes the All-in-One BioPellets a one-of-a-kind phosphate and nitrate removal system. With the combination of phosphate removal by the bacteria coupled with the All-in-One BioPellets, they have achieved an increase of phosphate removal from the water column by 10-20x compared to the standard NP Reducing BioPellets and NP Reducing BioPellet XL.