The high end luxury brands such as Silhouette offer very advanced lens coatings and materials that aren't found in any of the discount stores online or brick-and-mortar, so there's definitely a difference there. It's only their full priced partner shops that carry them. They also claim to use custom technology that allows their 10+ layers of coatings to stick together much better and not flake off.

The mid range to entry luxury brands, many owned by Luxottica, use broadly available lenses and coatings, or so the discount online stores claim.

I've never been to a discount brick-and-mortar store selling the full range of Luxottica products, usually only a few styles here and there. So I can't comment there.

What I'm asking is if the claims of discount stores, like that they have access to the same lenses as full priced Luxottica stores, are actually true.

And whether they are honest with their shipped product.

e.g. How would anyone know if they in fact got a X layer coated lens (where X could be from 3 to 8) from a discount shop?

It seems trivial to ship a X-1 layer coated lens instead, with a very low possibility of getting caught.