That's making it sound like Apple had significant design expertise that went into arm. But it was because they didn't have this test they cofounded Arm, because

That's making it sound like Apple had significant design expertise that went into arm. But it was because they didn't have this test they cofounded Arm, because they wanted a processor for the Newton and Acorn had the expertise. Moreover when Steve Jobs came back he sold off all investment in Arm, apple hasnt owned part of arm for a long time.