Yes, my other PVC kilt (not my USA semi-trad) came from one of Gold Brothers shops and has "Authentic Woven Tartan" on the label.
My very cheap acrylic kilts came from an English based e-bay seller and have "Highland Kilt -Designed in Scotland - Authentic Woven Tartan" on the label yet one of them isn't even tartan - its a solid navy blue colour.