Basically all this guy did was make a mod for a mod, its no different than us including modified Notch classes in our mod. He included modified RP classes in his mod. We don't have Notch's express permission to release his code yet we do anyway everyday? Its hypocritical to think that this guy did anything different than Elo has done a thousand times.
There is a fundamental difference in this, Notch is aware of mods but he has allowed them to exist, Eloraam wasnt even aware of the fact someone made that conversion. so she took down that addon. Is it so hard to understand that this is simply a case of disrespect to eloraam work? He did what he did without even discussing/talking with Eloraam about it, when she has expressed quite a lot to not do such things. That the copyright are trash and useless? Maybe, but that still doesnt give you the right to disrespect the developer, which will only making him/her to have a sour mood and consider either stop to developing his/her mod, or simply stop sharing his work with the public.