I've never seen that video, but I'm also not a big youtube guy. He seems pretty excited about what he does and calls himself "the moose whisperer". He does make a few good points, and I wish him well.
That said, I don't set-up to call with the wind to my back. When the wind is a factor from the get go, I'm pretty much always setting up to be calling into the wind. It is true that moose often want to circle around to approach from down wind, and I have turned around numerous times to see a moose directly behind me, especially during still wind moments. However, once a moose smells you, it's over and they are gone very quickly.
A couple of additional points not covered thus far. I don't cup my hands to call. I like using something to help direct and project my call. I've got a moose "bull magnet" that I've had for many years, which shows lots of wear on it primarily from scraping. They are great to scrape with and use when calling. Mine was a gift, and prior to that I simply used an antifreeze jug with the bottom cut-out...that also scrapes real well too and can be used when calling.
Moose are so good at figuring out exactly where you are when calling...from really far away. When using something to direct and project your call, you can turn and call 90 degrees, which I have done quite a few times and it has thrown the bull off in a good way for me. The bull I took last year sky-lighted on a small hill about 700 yards out, upwind from me and from the direction I had been calling. He came to me, but I had to turn him twice by directing my call to keep him coming my way instead of circling. The wind was my friend and I shot him at last light at about forty yards...from my tent.
Last point, with moose it is all about their nose. In my opinion, the worse thing you can do is begin hiking all around your hunting area. I'm not a sit around guy. I like to move, and see what's on the other side of that hill. However, when hunting, especially moose hunting, I've got to keep telling myself not to do that...and in the end it pays off.