Both, although I don't spend my time paying attention to my speech or reflecting on it so I wouldn't be able to give you an analytical answer. I know it's dying off, and that's enough. The end result is fluency, so yes anyone who does this will ending being a fluent speaker, so when they stumble, they'll stumble like a fluent speaker and not a person who stutters. But that's not really important. When stuttering does happen, it has zero impact on my psyche because I'm no longer reinforcing the mindset that created it in the first place. That's the important bit.