Why would anyone skip FIX??? Mr Kelly emphasized its importance.
I think Tong was saying this after establishment of a proper grip.
But....
Through experience, Impact Fix can be established before a round for each club. It is not part of every pre-shot rountine during a round but can be if you like. I would never tell anyone NOT to do it. Experience with my clubs (driver/5i/wedge) and the ball position alerts my hands to 'Fix.'
I do go into Impact Fix with a tough shot or crummy lie before me.