The article make assumptions and generalizations. While points the fab the A13 is made forgets to say where AMD products are made. (completely different fabs)
Also AMD is moving to 7nm EUV in the new year (different fab) in addition there are talks to use Samsung for some of the 7nm EUV products. (most likely the consoles).
Article makes a lot of assumptions but still supply constraint is likely going to be a bigger factor for AMD if it is at all than nVidia at 7nm.