Look, I already explained this, but highly regular chips such as AI chips can have malfunctioning cores disabled by laser cutting the contact traces for them. You make the chips, test them, disable the non-working cores, package, and there you have it. You can just bin the chips with more functioning cores and sell them for higher price, or you design chips with enough extra cores, that you will get the amount you want as working most of the time, knowing the defect rate you can guess how many non-working cores you will have and make it work.
It is not as much of a big deal making larger area chips as some people think.