Was there a Computer Science degree when he was at school? His degree was in Physics. How do you get a degree in CS when no degree in CS is offered? To imply y

Was there a Computer Science degree when he was at school? His degree was in Physics. How do you get a degree in CS when no degree in CS is offered? To imply you need a CS degree implies that there has to be a degree for you to be considered an expert in it. What if you invented the computer? Are you not qualified because you didn't get a degree in your invention?