Marvin Minsky is dead, so you shouldn't refer to him in the present tense. He is unable to have opinions about current events. Secondly, Minsky was skeptical about neural nets, and he was ultimately proven wrong. Even great minds make mistakes. In the 1960s, we did not have the confluence of big data, much faster hardware, and certain algorithmic advances that make current deep learning performance possible. So what you say is partially false. We had some of the ideas in the 60s, but we were missing certain conditions necessary to support and prove them out. Now we're not missing that, and AI progress has greatly accelerated.