Neither Coke nor Diet Coke are nutritious. Whether one or the other is a risk is specific to a person, and aspartame as well as other sweeteners aren’t fully understood in terms of risk.
I think these kind of simplistic statements serve to stoke fears around food than actually help people understand them. Added / excess sugar is associated to health risks but ultimately people need to understand their own health as individuals.
Here’s a Healthline article (by no means an authority but still fairly informative) to help expand.
Are you exaggerating or do you have actual sources? I did some searching around and can’t verify your claims.
The choice to reject new information just because something has been studied a lot is a very anti-science take.
People should understand aspartame, and understand sugar, as much as they can and make their own choices for their health.