It is specifically a bottling product, so I don't think yeast nutrient has anything to do with it, but I could be wrong.
I used it on a Flanders red blended - after 8 months of aging: 1/4th from an oak barrel and 3/4ths from a glass carboy of the same batch - ABV around 7%; Roselaere blend yeast, so Brett still working slowly. I tried it since it had some yeast referenced as an ingredient and I was going to re-yeast with US-05, but this sounded easier for bottling a gallon while the rest continues to age in situ.
I intend to try a Solara style of aging and blending, so I will make a much smaller ABV batch for blending going forward. I might try an all Brett batch, for example, if I can keep it warm enough.
I was hoping that this product would allow me to easily draw off smallish samples to blend and bottle - then carb with it.