sampoyigi Yes, that is true, however in order to update the child theme with the new code in the parent theme, a manual process like that should not be the requirement. If the modifications are to the code in the parent anyway, it should be easy enough to copy those to the child via a similar process used to create the child in the first place.
I tried to update the child by customizing the parent and choosing the create child theme. I got the message that a child already exists and it did not create a new child nor update the existing child.
I then deleted the child and kept the data, created a new child and the record still remained showing the original child and the new child as well. But in the new child, none of my previous settings were reflected.