For one thing, we haven't remotely achieved that. GenAI is a statistical model, it cannot think or reason. So one reason he might lament the status quo is because it has people thinking we have achieved AI when we haven't. But also, it wasn't apparent until recently that even if the tech did work as promised, it will be an awful thing because humans will use it to bad ends. I don't think it's particularly blame-worthy that he didn't foresee that 50 years ago.