They say so. If it wasnt for cloud and huge consolidation with facebooks google amazon imo they wouldnt stand a chance entering that market. Seriously Intel uses more r&d on packaging than amd entire cpu r&d budget and have huge technical sales support. That account for something unless you can do it yourself like the monster players.It is a design for servers first of all. Desktop and mobile is purely secondary at best.
But perhaps zen is leaner and smaller than we think and therefore also a good fit for laptops and consoles. They didnt bring big fat fpu so it seems to me there is more posibilities - its no k7 here.