Contrary to what many believe and camo companies would want you to believe camo is not a requirement to kill critters.
One of my favorite most successful camo patterns though was a gray shirt that matched the seats in the truck almost exactly aka Bobo the Clown style hunting.
I have killed deer with a recurve bow at 8 and 10 yards before I owned any camo one from a couple boards in a tree between a couple limbs as a stand the other I watched her bed down in a cutover in a light mist, slipped in to 8 yards and shot her in her bed, again before I owned camo. I have sat at the base of a tree wearing the old green coveralls with a blaze orange hat and vest to be legal and had deer within arms reach and killed quite a few that way inside 20 yards with a rifle. I have had turkeys within arms reach as well with the same clothing during deer season. Almost forgot the button buck I backhanded on the nose one morning he was so close but youngster probably had never encountered a person.
My guess the one on the cover photo though was killed from blind or truck. in either you are hiding most of the camo and it generally doesn't match the pattern of the inside of a blind or truck most of the time.
It’s not mandatory but I do believe it helps ( certain patterns at least). Being still always trumps a camo pattern however. Many traditional bow hunters to this day eschew camo in favor of darker plaid.
Most predators in nature are tawny and drab with many wearing camouflage, like leopards, tigers and jaguars. You’ll never see a predator with a bright colored coat. Even birds of prey are drab compared to other birds.
My favorite pattern is the old ASAT, which you can hardly find anymore. Vuni is very similar but not an exact match.
But, in Texas we have all the camo cowboys in head to toe Kuiu when they are sitting in a truck or box blind. And on that I agree is pretty pointless.