Agree SARS-CoV2 doesn't cause hemolysis directly, though multi-organ failure with DIC will. Likely mechanism of action
of hydroxychloroquine (Plaquenil) is similar to its benefit in autoimmune disease - reduces production of pro-inflammatory cytokines (ie blunts the "cytokine storm") via its effect on T cells, macrophages, and other factories of IL-6, TNF, etc.