Sorry but a study of 16 developers isn’t a big enough sample to get any meaningful data, especially given the massive range of skills and levels of development.

I’m a developer and I use AI - not much, but when I think it can help based on the suggestions that it gives me since it’s integrated into visual studio. It doesn’t slow me down, it speeds me up. It could slow you down if you rely on it to do everything, but in that case you’re just a bad or lazy developer.

AI is a tool to use. Like with all tools, there are right ways and wrong ways and inefficient ways and all other ways to use them. You can’t say that they slow people down as a whole.