With autoimmune diseases the body produces antigens, just like the antigens against viruses, except these self-antigens see parts of your own body as the enemy. Those self-antigens call in the whole panoply of troops, CD8 cells, CD4 cells, NK cells, macrophages which then go to work attacking you. Leronlimab shuts down that bugle call for action so the war is over before it even began.