Without a control, this is speculative at best. Sure - coffee has nutritional components, but unless you have a control to measure the results against, there is nothing conclusive nor definitive to be had from this.
have you ever fed coffee to just the pitchers and not the roots/substrate?
wow. I don't think I have ever seen eddies with such a nice pitcher:leaf ratio. Is this from a windowsill? shade grown or greenhouse grown?