You mean this one: https://www.youtube.com/watch?v=QdQL11uWWcI ;) IMO, I wouldn’t underestimate the robots at RoboCup. Of course, students have less funding than big corps but to say that they aren’t better than those built by big companies is just wrong. Some of them probably are more state-of-the art than you think. In terms of AI winter, I know this one but that was more to a different reason. The entire AI research was not doing well because easier models like SVM performed much better than perceptron so that a lot of funding went into this area. Now the entire AI area has a second spring because of advancement in hardware, data and also algorithm, so this is a different story. I know about the machine learning history;) With regards to the graph, this was a graph from 2013. You can find AI or machine learning now on the 2017 graph.
