I really don't know. It could be the creator's unique idea gone wild or an attempt to stand out. But such a thing seems quite odd and hard to understand.
The comic strip might focus on the humorous and everyday adventures of the two guys. Maybe it explores their friendships, challenges, and funny mishaps.
In the Old Guard comic, Andy retains her immortality. The story doesn't involve her losing this trait. The immortality aspect is a key element that remains consistent.
Since we don't have much information about this 'andy black story', it's difficult to say who this Andy Black is. He could be an ordinary person with an interesting story, or a local figure in a specific community.
As I said before, without more context, it's hard to determine who exactly Andy King is in the story. He could be just an ordinary person with an interesting life experience.