True but I do a few inverted card tricks and I use a deck of dealers most of the time. It is much easier to hide the inverted card if they match like you said.
With all the versions of the back posted, I like it without the lines more than with.
The Dealers are a MUCH different back design. A small, repeating back pattern like that does indeed conceal inverted cards to a degree, as long as you keep the deck stack held straight - the same applies for Bee Diamond Backs. I advised Uusi to reduce the size of the repeating pattern on the Pagan deck to achieve the same effect! It creates an effect much like an optical illusion and acts like camouflage for the inverted card when seen edgewise. If you inverted multiple cards, however, you stand a greater chance of getting caught at it.
When the alteration is a small but noticeable area that prints into the bleed on one side but not the other, that's where it's more easily detected. Even worse is when the entire back is printed a solid color and the face is either white or a very different color.