This was a blogger on Weibo which is the Chinese version of Twitter. I noticed some people doubting the truth behind this story, and while i can't comment on that since I don't personally know this blogger, let me just clarify the story, as I was following this on Weibo.
The story was that one day this individual notice the inside of her gst coming apart a bit (maybe due to the defect that people are referring to). And when she continued to look more closely at this "rip," she discovered that what was actually holding together two pieces of material on the inside of her was was double sided tape. I think at this point her concern was simply disappointment that $3k bag is put together using double sided tape (as opposed to 100% using stitching and thread, I suppose.) According to her posts, she then took the bag to a Chanel boutique and was told that many Chanel bags contain double sided tape.
This was a while ago, but from what I remember, she documented this entire ordeal, from discovering the tape to going back to the Chanel boutique through the Twitter-like posts and pictures on her personal Weibo. Again, while I'm not vouching for any part of this story, I personally don't see what good it would do her to make this up. The area where she says the tape was found is inside the bag, and would not be seen unless one took apart the bag (or if there was a defect.) I don't think her point was to say whether Chanel should or should not use tape for their bags, but more of a personal rant, if you will, about paying a large amount of money and getting something that was different from her expectations.