He indeed does have strong outside edge in the moment of the take off, then when he goes more into the air that changes. The same thing is shown in this video of ISU, when she goes more into the air, her edge also changed like Boyang's. But only when it is up into the air. I watched this ISU video with 0.25 on YouTube. So what is your point?
That's the point, his edge changes from deep outside to flat, while he is still being on the ice. I don't get that condition "more into the air". And i don't see that in the ISU video on 0,25 or frame by frame. It is either you are on the ice or in the air