I randomly clicked on the timeline and got a Coca Cola PR guy talking about how the ingredients "come from nature" over a closeup of "high fructose corn syrup" at second place (after water) in the ingredients list on a coke can.
Because he's using a nebulous weasel marketing catchphrase that can be applied to anything unless government regulators say it can only be used to describe specific things.
He's also not calling the chemicals listed in the ingredients "natural". He's referring to the secret ingredients used in flavoring.
I'm pretty sure I've expressed this here before, but "natural" is an arbitrary and subjective descriptor by definition if you spend five seconds thinking about it. The only reason you think about it as something positive at all is because marketing guys want you to, not because of any logical definition of the word.
Soda is not unhealthy because of "chemicals", it's unhealthy because it's just sugar water. It doesn't matter if it's coke or ultra high end "organic non GMO" fruit juice, it's all just empty calorie sugar water.