"go alot deeper to the enlightened state" doesn't sound like something a vipassana meditator would say, unless he misunderstands what the practice is about.
I notice when I fast that sensations in the body are stronger, and my awareness a little more vivid. I do believe after a few days when the the sensations from toxins subside that one would have an enhanced ability to concentrate but I've only ever fasted for 2-4 days at a time so haven't experienced this.
I don't think there is a recommended cleanse in vipassana circles, I don't recall hearing a teacher ever recommending going on a cleanse.
"Whenever we feel that we are definitely right, so much so that we refuse to open up to anything or anybody else, right there we are wrong. It becomes wrong view. When suffering arises, where does it arise from? The cause is wrong view, the fruit of that being suffering. If it was right view it wouldn't cause suffering." - Ajahn Chah
"Remember you dont meditate to get anything, but to get rid of things. We do it, not with desire, but with letting go. If you want anything, you wont find it." - Ajahn Chah