At least to me it's not inconceivable that somewhere along the line of people writing definitions basing themselves on other definitions they see, that someone

At least to me it's not inconceivable that somewhere along the line of people writing definitions basing themselves on other definitions they see, that someone saw that people defined CPUs as including main storage and although it may or may not have seemed weird to them, they might have included it in their own definition, thereby mixing both meanings of CPU.