That is a very different thing and has nothing to do with Apple per se. Those are stock integrated GPUs made by Nvidia — and they were integrated into the chipset, not onto the CPU package.
And this is exactly what I'm talking about. AMD has announced integrated Vega GPUs, and since their own mobile CPUs already come with similar iGPUs, the only possible target market are ultrabooks with Intel CPUs. So why exactly shouldn't Apple be able to implement these?