I mean, not only is it there in plain letters, but that particular clause was all over the interwebz! The fault here lies solely on the developer for spending all that time and money on development without reading the contract.
Or maybe I should say "praise". This is most likely a PR stunt to increase awareness of his product so he can then go sell it to jailbreakers (who are probably more likely to use, enjoy, and be able to understand it anyway).