For me, I had a gut which wouldn't go away for years, no matter how hard I tried. When I started the strict anti-yeast diet, it disappeared almost overnight.
If yeast is the cause of the fat you can't lose, then it should eventually go away as you continue chelating. Or, at least, that's what's been described to me by other people who have chelated.
When I began chelating, I had been following the anti-yeast diet for a while, and I was much too thin. When I had been chelating for a while, my weight stabilized. Now I'm very happy with the weight I'm at.