I dunno, he starts with a fresh sheet of foil that has obviously been pulled off a roll at home, not one that has been folded small and been riding in a PSK for months. I think foil that is unfolded from a PSK would very likely have holes or at least weak spots along the fold lines.
I see your point. Foil tends to do that and loose strength when folded and creased to many times. I think I read somewhere on this forum that rolling your foil instead of folding it helps it last longer. You could always try it out. Test it using folded foil and then rolled foil.
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