You posted a quote from 1979 in which GL clearly says that there are 9 films and that he has story treatments on all 9. Twenty years later he changes his mind and says that he never had a story for the sequels. So which is it? In '79 he said he did (it's in your quote), but in '99 he said he didn't.
The proof is in your own post. I think I'll just start quoting you from now on.