We also see he is flexing his outside leg in Fig. 1, to flatten the ski, this constitutes a PMTS "Flexing Release", taught in the system and it is one of the Essentials of skiing.
In the last photo you see the tipping of the new inside ski and boot and the leg that follows. This creates the "knees apart", look and delays the on set of the new outside edge, until after the body has crossed the skis and is lined up with the forces of the turn. This is another one of the Essentials of skiing, Inside leg "Tipping", in this case.
There are many misunderstandings in ski teaching and coaching technique. What is astounding, is that the really talented skiers get around the poor advice and let their natural instincts take over. However, even after these athletes have success with movements that are different from what the coaches suggested, many coaches justify the difference with tailored explanations that on the surface look reasonable, however with further investigate and proof, they end up completely incorrect. This is why it's so difficult to become a good skier with the instruction that is generally available. Unfortunately there are not many approaches that lead to skiing correctly that is why if you stick to the program of PMTS and learn to move with the "Essentials of Skiing, you won't have get confused.