lol, more assumptions, what is your agenda I wonder?
Do you have any evidence that confirms that lodging Gallstones in the duct, is rare. Or is this just more nonsense?
Your link is to a sales site, of course they are going to push their products.
This is precisely why I recommend people research outside of the internet for information, and learn how the body works, and learn a bit about anatomy. They will then have information from creditable sources, not internet sales sites.
This way they will not fall victim to pushers of protocols that could end in a very serious complications.