That's the thing, people are taking it literally when it was an figure of speech otherwise he would have said 2%.
The whole showing breezed over things and left probably just as many questions on the table than it provided an answer.
CPU side of things shouldn't be a worry I believe it is a Zen 2 8/16 after all, which in turn bodes well for GPU side of things as well.
Well we'll have to wait and see. Might be few months until any other hardware info as detailed as GDC (even if not much was reveled then).