A simple answer to the OP:
You are correct. During chemo the patient will require multiple transfusions of both packed red cells and platelets (two different products) to combat the side effect of deadly low counts, even if proactively taking erythropoietin & iron supplements.
Jehovah's Witnesses do not accept packed red cells or platelets. JWs dx'd with leukemias and lymphomas must be treated at "bloodless" cancer centers in large city University hospitals, who offer more obscure and/or experimental alternatives and clinical trials. Even then it can be touch and go.
Hemoglobin transfusion is listed as acceptable but its trial has been pulled and is essentially universally unavailable.