He exaggerates or straight up lies about the games he has made. Despite some of them being very good, they still under delivered on many outrageous claims Moleneux has made.
Like with Fable, he once said shit ranging from that you’d be able to do shit like carve your name in a tree and watch it grow and the scar evolve over time and even seemingly minor things like fighting a dragon as a boss which didn’t come to fruition.