Mark that phrase and understand it as early as possible. That's the future of UI design (especially on the Web and Mobile user interfaces.).
Skeuomorphism died in iOS 6 (and other systems) and Flat design is the current trend.
BUT the limitations of the Flat UI design technique are already being realized and leading designers are already shifting their focus onto #TactileDesign and Z-Axis design concepts. The later part of this year and the next few years will prove this.
If you are web designer, a mobile app designer, a software UI designer, get ready!!!!!!
Y'all know where you heard it first!!!!