Diana is happy to have her tips diverge. She tips both skis to their LTEs, going bow-legged, to begin the TFR. Then she flattens the inside/downhill ski to release, holding that uphill/new outside ski on its LTE long enough to make sure that it does not get onto its new edge before the new inside ski does. This is all intentional.
PMTS has a drill called "Ride the Pig" which has the skier holding both skis on their LTEs while doing a straight run. Learning to do this increases the skier's ability to purge the habitual flattening of the new outside ski first. Skiers are taught to hold the uphill/new outside ski on its LTE while flattening the new inside ski with flexion as they begin new turns.
Diana is especially good at holding that bow-legged stance, and it shows up clearly in her videos. As a consequence her tips diverge. I suspect that for the PMTS folks, diverging tips are preferred over converging tips.
Much of PMTS teaching is focused on getting rid of the stem entry that so many people have because they focus on the new outside ski instead of the new inside ski. PMTS attributes the predominance of this outside ski focus among recreational skiers to the turn entry extension move off of that ski. I'm not sure this is the fault of any lessons people had in the past. However, it is common around here for recreational skiers who don't take lessons regularly to focus exclusively on the new outside ski and pretty much ignore the inside ski.
I'm sure the people who are committed to the PMTS way of doing things will be able to improve on my explanations. Everything PMTS has a very rigid way of being done correctly, and HH makes sure people know that there are the incorrect ways of doing things, almost correct ways, and the one and only actually correct way. Only the actually correct way counts. I don't know enough to get those details right in my explanations, since I'm not one of those committed people.