I don’t remember that thread, but without being purposefully judgemental about someone who isn’t there and I know nothing about, because that’s just mean.
IME, appropriate leads don’t just snap... I mean, maybe she had a fluke one with some sort of manufacturing fault, but that could happen with any piece of equipment.
I’ve had cheap longlines I’ve been using for puppies inside the house just break, but I’ve been aware they weren’t appropriate for real use, so it wasn’t a huge deal, I’ve known people using flimsy extendables have them snap, but not normal short leads suddenly go from being in good condition to just broken.