Lots of people see the potential for AI & robotics to replace human work, but you rarely see mainstream economists deviate from the party line. The normal response is - nothing to worry about, new jobs have always been created by automation. Many people see the flaw in this answer. What about when AI & robots can do the new jobs too, but for pennies on the dollar compared to humans? How will human-employee businesses compete?
The IMF is a major pillar of the mainstream global economic establishment. For them to come out and say this out loud is significant. It means the topic is given a credibility and urgency it hadn't had before in national governments, the world's central banks, etc, etc