I think I did a poor job explaining. The key point is that, if “extreme autism” is a disease, that doesn’t mean all autism is a disease. To improve my example,

I think I did a poor job explaining. The key point is that, if “extreme autism” is a disease, that doesn’t mean all autism is a disease. To improve my example, it’s like describing left-handedness as a disease because a small percentage of lefties experience extreme left-handedness where they can’t use their right hand at all.