This is true, but the right wind doesn't mean your perfectly down wind.
That was the reason I quoted Barry Wensel. I really like when wind is almost wrong for me. It give approaching deer a false sense of security. But during the course of any day, that "almost wrong" wind will drift and become mostly wrong and it usually happens at the worst time. That exact thing happened to me in 1996 with an approaching 200" buck. And it wasn't even him that busted me, it was the doe that was 40 yards ahead of him that kinda, barely, sort of, got the slightest whiff of me. They were walking right down the trail I needed them to but that ever so slight drift in the wind screwed me. She got a little nervous and changed direction and he followed unaware that I was even there. That buck was killed a few years later (with a smaller rack at that point) and he netted 196" and some change.
I'd have to say that day had the biggest impact on my attempts to reduce every odor I can. Just laying eyes on a buck of that caliber can change a guy. I saw that deer 5 times in 2 years. He had a huge effect on how I prepare for a hunt.
I do defend my tactics but that doesn't mean that I insist that others follow my tactics.
My butt does get tired of hearing the phrase "works" or "doesn't work" when it comes to odor and wind threads.
It's all a matter of degree as to whether something "works".
The number of variables involved in busts is something we cannot calculate and science cannot measure.
The most successful "wind hunter" in the world will be more successful when they reduce odors. The best hunter will do both.