Guessing they mean this. Its intended as plant fertilizer, likely for the trace minerals seaweed tends to be heavy in - but without knowing what seaweeds, its all guesses after that.
and here is
the Dr. Earth website for it. Its their only kelp product. (OK, they have liquid seaweed concentrate). Anyhow,
here is the MSDS for it, because the main product page tells you nothing. (We are still calling them MSDS sheets???) Anyhow, the MSDS tells you almost nothing more of use.
No, I would not use it. There is nothing to recommend it - simply no information on which to base a decision, except that it doesn't claim to contain anything I value in chicken feed.