I watched the first video. One point they didn't mentioned is that their android example of the "last small flagship phone", asus zenfone 9/10, is about the same size as an iphone 12/13, not the mini.

Do regular iphones sell well? If so, the small flagship phones are not dead, because iphones are not dead. If iphones are not counted as small phones, then the small android flagship phones are dead long time ago.