I don't think the fabric is folded. She says it's the "edge of your fabric", not the fold of your fabric. She just cut it down really small (maybe she's making a pieced binding strip for that 12x12" square featured earlier in the video??? lol). I agree, though. If you have a lined cutting mat, all you need to do is lay the unfolded strip straight across your mat & then put your ruler on the 45 degree line & slice. But there are all kinds of tools and gadgets out there that I would never buy. If someone else gets some benefit from them, good on them.