I'm no German speaker, but I'm French, and without invalidating your initial claim (about the AI generated stuff), in France we do translate "good morning" by "Bonjour", which literally means good (bon) day (jour).
Any other translation would be weird: if you'd translate "good morning" by "Bonne journée" -> that would be super weird, because this is something one could say in France to say "Goodbye" xD
I lived in Germany for a short time back in 2022, and notice that saying "Hallo" is used a little bit everywhere. However I can tell you that you are NOT supposed to say "salut" in France ANYWHERE except with your friends.
Like, imagine, you're in Germany you enter a bakery, you can say "Hallo" -> no problem. Same situation in France and you say "Salut" -> either people will react badly or assume that you don't know French or maybe they'll think you're impolite for no reasons