That information is not entirely correct. AutoFit, which is what is being referred to, allows, with clone shapes, for conforming items to be converted but doesn't do anything for figure textures or morphs, and doesn't preserve custom bones (which I imagine the tails use) - Genesis 8 has clones for all earlier Genesises so to the extent that it helps it will work out of the box. Morphs can be converted (by GenX 2 up to Genesis 3 and then Zev0 has a morph transfer tool for Genesis 3 to 8); Cayman Studios has sets which enable textures to be used but for Genesis to Genesis 8 they rely on additional body parts to bridge the areas where the division into surfaces has changed.