I think this along with many other things proves why experimentation is virtually essential when living with diabetes.we have to find out what works for us as individuals , unfortunately it doesn’t happen overnight , but with perseverance it does happen and makes the journey of diabetes much easier.
on the subject of diet cola I’m more of a Coke Zero man myself not because it effects my sugars less ( neither do ) I just prefer the taste
good luck to all on our life long experiment