Do you really think autonomous robots are simply the tools!? They won't just augment human's strength and mind as machines did in the past but replace human workers altogether in the most sectors!
If these machines are capable of replacing us, then why would they care about us or do anything to keep our species going? Where would a guaranteed income come from?
The real problem for socialist economies is that there are simply no economical solutions for the technological unemployment utopia. Period!
All proposed solutions for tech unemployment I have ever read are more or less socialist. It will be very interesting if you can to suggest market-base one. 
He was saying that the tech unemployment problem is only something that happens in a socialist system, and can't happen in a capitalist system. Thus, there is no solution for tech unemployment in a capitalist system, because such a thing simply can't happen in that system.