Let's try and be nice. We have no idea whether this woman is actually an experienced traveler. She certainly doesn't appear to be from this video. (This person has just over 12K followers, which isn't exactly a lot, so she's not making millions from this video.) People who aren't influencers make mistakes all the time and leave medicine in their checked luggage. There's certainly evidence and examples of baggage handlers stealing items out of checked luggage, both in America and elsewhere. I can say with some confidence that people pack more than $12,000 worth of items into their checked luggage - I once stood in line for 30 minutes at MXP in the EK F checkin line behind a passenger (and his family and porters) who had, by my count, 28 bags. My guess is that there was probably more than $12K worth of items in several of those bags.

Should this person have checked five digits worth of clothing in her checkin? Absolutely not.
Should she have insurance if she's doing that? Yes, and I hope she does.
Is it possible that she's lying or exaggerating with regards to this story? I suppose, although I would argue that there's much better ways to get traction and attention on the internet than complaining about luxury goods getting stolen out of your bag.
If it did happen in the way she explained or something close to the way she explained, does she deserve to have these items stolen out of her bag as a lesson? Of course not.