The basic argument that Mr. Stanton is making is that gender reassignment surgery isn't necessary. He does this through a rather roundabout argument that attempts to link Gender Dysphoria (GD) with Body Integrity Identity Disorder (BIID).
Phenomenologically speaking, GD and BIID carry some significant similarities. Perhaps the most striking of these is that patients who experience these conditions frequently can trace it back to their early childhood memories (First, & Fisher, 2012). Second, both describe significant dysphoria resulting from their condition, and may seek medical or psychological intervention to alleviate these symptoms. Dysphoria is a shockingly rational experience, quite distinct from clinical anxiety or other experiences.