Yup, I definitely think that IF is part of the magic. Ketosis makes IF easier, in my experience, because of that elimination of the hunger impulse. Even on the days I do eat, it's usually not til mid afternoon - I don't intentionally practice IF anymore, but my eating patterns tend to fall naturally into an 16/8 window.

It's very hard to adapt initially, especially if you grew up religiously starting the day with breakfast, but the difference is pretty evident once the adaptation happens!