Not necessarily. They may simply mean that Windows is properly differentiating physical cores from logical cores, which is true. The Windows 10 scheduler IS doing that right. There's nothing broken with it. That being said, it isn't optimized for Ryzen, because of the two CCXs acting, in some ways, almost like separate chips. So AMD comes out and says, basically, "calm down, people, Microsoft didn't do anything wrong." Which is true, and builds some goodwill for AMD... so that hopefully they can convince MS to optimize more for Ryzen. In other words there's a difference between being broken and being unoptimized.
After all, you don't build goodwill by blaming Microsoft for everything -- it was AMD that decided this was the way they wanted to do it knowing full well that Windows wasn't currently optimized for this scenario. They had to know this would be an issue. Give 'em some time.