In the video you posted the coach says 1 is address, 2 is impact fix and 3 is address with the impact fix. It appears to me the impact fix is a forward press where he regrips the club giving him a stronger grip before feeling the need to return the club to perpendicular to the ground before starting the swing.
Why not just start at impact fix and make a swing from there?
A lot of mainstream coaching is obsessed with straight lines when they are irrelevant to the result. Why do our feet have to start parallel to the target? Why does our club have to start perpendicular to the ground from a front view?
I always saw Nicklaus as starting with a small forward press in his setup and I think McIlroy does as well.
I realise club golfers don't move like the best players but they can still start their swing from a desired impact position. This is what I like about Noren and following Noren's method would look different for everyone because he isn't chasing a look. He and his coach are chasing a result. I think the "mainstream" starting position is one of the reasons so many amateurs struggle and that was just something I noticed in the video you posted that looked odd to me. If the impact fix is such a good thing why not just start from there and let it influence everything about the setup?
Most club golfers, if they setup with impact in mind, would look more like Trevino with an open stance and the ball back relative to their feet to allow for their lack of athleticism.
Madness,impact fix would put hips in "impact"position,so his hips would be in different position ?,in fact most of his body would be at impact....feet included.....the pics above are simply address positions ,the above pic you show of trevino is open,what was trevinos favoured ball flight,i do believe it was fade