It's probably not great if you're drinking dozens of cans of sugar free soda every day. All I really know is don't take health advice from influencers, especially if they're selling something, and don't take health advice from people who support deregulation (less industry transparency, oversight, and consequences won't make food or anything safer.)
Not that I always follow it.. but my general advice is to keep sweetened drinks to with meals, and to reduce/eliminate snacking altogether. Sweetened drinks, even zero calorie, sugar free causes some glucose mobilization and insulin response... this insulin response likely contributes to insulin resistance over time. That's just my not a doctor, observational, take on it.
The answer is no - sucralose, saccharin, aspartame; it doesn’t matter, diet soda and artificial sweetener does not affect blood sugar in any detectable way, at least for me. It was one of the first things I checked when I got my CGM.
“It will crash your blood sugar” and “it will spike your blood sugar despite not having carbohydrates” are myths.