The leading hypothesis is the same one that explains why women get more autoimmune disease generally. Women mount stronger immune responses than men - protective in acute infection (men had worse acute COVID outcomes), but it comes at a cost: women are the large majority of lupus, MS, Hashimoto's and RA cases. If long covid is substantially autoimmune/inflammatory, as the autoantibody findings in the OP article suggest, the group already primed for autoimmunity is the one you'd expect to be hit hardest. Proposed drivers: immune-regulating genes on the X chromosome (e.g. TLR7) and estrogen being immunostimulatory where testosterone is suppressive.