Q. There were previous failed attempts of natural language search engines. Why would this work now?
A. Natural Language is a wide term that includes all sorts of things. Previous attempts have failed mostly because they were not done properly, and methods used were not based on proper semantic principles. Some of them were merely statistical methods very similar to the conventional search engines. Others were behavior tracking AI applications. And some relied on human labor to keep up with question answering. There are so many ways of doing it improperly, and only one way of doing it right. (Emphasis mine)
In other words “My way, the only true way.” Is he so narrowly focused that he can’t even imagine that there might be something new that hasn’t been thought of yet? I hope whatever he’s got isn’t contagious.