Think of the elk's nose like your ear/mind listening to a band playing song that you sing along to every day. If the vocalist sings the wrong words in the song, you'd immediately look up and say "WTF?!".
Wild animals can distinguish the scent notes all around them, period. I once read a hunter's story about a bear (granted, not an elk) that had its head buried deep in a rotting carcass, he approached and wind shifted, putting him upwind, the bear suddenly jerked its head out of the carcass , checked the wind, huffed, looked at him and ran off. If the cover scent of a rotting carcass didn't work, nothing will. I once also hunted with my brother, who was in a ground blind 100 yards from me in light wind. I saw a buck approach his blind from down wind. When that buck came into my brother's scent stream at over 100 yards away, he did an abrupt about face... despite the blind, no-scent detergent, etc...
Also reminds me of the "Ozonics" You-tube demo I once saw that shows a buck crossing directly under a tree stand while a "hunter" sits in it and releases a small cluster of goose down to supposedly "illustrate" where the hunter's scent is going. Of course the goose down drifts toward the buck... Joke of an advertisement, really. That goose down weighs a thousand times more than scent molecules, which no doubt were still high aloft and had not drifted down far enough for the buck to smell.
I am suspicious of any ad that claims a product masks/covers scent or fools animals like elk. Same with the need to have the latest/greatest camo pattern that match on every piece of gear you own. Call me a luddite/curmudgeon.
JL