Earlier quoted context omitted.
which lens on my iPhone? Just the camera app like everyone else. For the good photo, it's a 30mm lens on Sony a6400 (45mm equivalent)
Yes, but on the camera app, you should set 3x to use the longest lens. This will avoid distortion.
Actually using the iPhone telephoto for a group photo like the one shown in the article would require the photographer to stand a considerable distance from the subjects, and then we might start noticing a little perspective distortion from the 45mm-equivalent lens on the Sony.