Re: "discrete graphics class performance with the efficiency of integrated graphics"
They are talking about package-scale integration - putting a GPU die next to the processor die (which AMD are probably already doing) & with the transistor doubling due to a die shrink it should be feasible to get midrange graphics performance from such a device. Both Intel and AMD are nibbling at the bottom end of the discrete GPU market with Tiger Lake and the Ryzen "G" parts. Hence my guess that with a die shrink they might get into what we now consider to be midrange graphics performance.
The main limit to performance will be (as usual) getting rid of the heat.