The miscegenation of terms used for these disparate wines has been a substantial hindrance to coherent discussion of them. Organic and biodynamic refer to the growing of grapes. Natural refers to wine making. So organic and bio wines may or may not be natural; natural wines need not be made from organic or bio grapes.
As I understand it, a bio wine can be manipulated many ways during the winemaking process, and a natural wine can be made from grapes that were subjected to many kinds of chemicals in the vineyard.
Add the fast and loose prose of winemakers, sellers and soms and the current towel of babel comes as no surprise.
And that's why I'll pretty much be sticking with beer and spirits.