AMBOSS emphasizes antibodies; to my understanding CD4+ immune response entails humoral response/antibody generation, no? At least depending on the type of CD4 cell involved
https://next.amboss.com/us/article/6R0jLf?q=pernicious+anemia#Z23d6b596faa18f57dcb166c93439d25e
Also see FA23 pg 386, which notes autoimmune gastritis, preceding pernicious anemia, is due to generation of these autoantibodies via a T-cell mediated response