From what I read in his post, his wife talked to their son thru the glass window of her car. She wasn’t IN the car with him, so no need for her to start treatment.
What I read was ambiguous. She took him to the hospital...but she could have been in a different car.
And if you noticed..he is young and healthy.
People walk around with no idea they have co morbidity issues until something is found on an incidental imaging scan, or blood work, or something triggers it.
On reading his post again, it sounds like Cody’s parents both had brief limited contact with him. Nobody rode with him in the same car though, so hopefully they’ll be fine.