He missed one thing. Use SL skies on a soft, "amazingly prepared" groomed run :p Seriously, that's the most important part.
hero snow helps, especially in the beginning.
on steeper slopes though it has limitations - it won't hold well to the "shearing" forces applied I guess and you end up drifting a bit... which in itself is an interesting threshold. Speaking from my own experience and from teaching many others, one big threshold towards big angles is when you have to let go of that solid carving feeling of a blue/advanced skier and progress to the big angles, where it starts to feel very different - the top of the turn always feels less definite and that's why also brushing vs carving becomes a pointless discussion at some angles and why most experts are like "carve, brush, whatever" at that point.
- this is why I was saying that the guy's drills will help at a lower level, they do nothing to get one familiar with the top of the turn feeling at the really big angles - I don't think he got there himself... while the JFB video is specifically about that and the soft touch he's talking about does lead directly to losing that firm pressure feeling... and that's the first step towards really big angles.
on steeper slopes, we'll prefer hard snow.
Also, once you dial it in, it's not a
big issue to ski in "bad" snow either. Visibility matters more, so you can plan your line and apex in the right place. Yesterday we had some fresh with a good base, but that meant 6-10 inch random piles - and it wasn't a big deal. You need to keep a more relaxed approach to the outside leg, to be able to absorb when your line is off - here good skis matter, like a 85-90 underfoot and a bit of tip rocker with a lot of metal in the body of the ski - I was on Monster 88s which were good for that stuff... and, before you ask, those can bend in SL turns easily at big angles...
... it would be harder to ski fast and big turns in heavy 3D snow, as you'll hit piles under pressure - that's what you see Greg doing in that CO video - with SL turns, the "pressure" is narrow and you can plan your line better... at the same time, deeper soft snow doesn't hold up to a SL turn, so those are the things that dictate your limits...