For JULIE Super T's that is indeed a good deal, especially if they are in pretty good condition. Julie Super T's are much harder to find, especially at good prices, compared to Joey/Billy/Bobby Super T's. They Retail for $319 so $129 is decent. I typically price mine around $189-$199. I am always super stocked to get Julie Super T's for personal use at close to $100. So you did well.
Slightly loose stitching is common on even brand new pairs of Super T's because there is so much of it and it catches easily. Are they actual broken threads or just some loose ones?
Unless there are actual large section of thread broken, I do think that worn/washed once could still be a possibility. They look to be in great shape in the pics.