If their 4nm aren't doing well ( or at least on schedule ), pushing your 7nm capacity towards lower end lower margin $122 chip doesn't make any sense. Of course, that is not ruling out the possibility of Intel being completely irrational.
They might just sell CPU dies where some cores aren't working.
Also these chips are important for business customers where lower end designs are important and they make the money by selling huge amounts.
Just out of curiosity, how do you know the die is designed with four cores? I would be interested to know which chips have cores disabled and which don't.
How does that follow from this?