@christof good and important point, and thanks for the glimpse into the numbers! I think it would help your case and #OpenAccess arguments in general, if these access statistics were included prominently in the #IJDH journal site.
Springer's own page e.g. at https://link.springer.com/article/10.1007/s42803-023-00068-9/metrics does not show much, only the page views of the abstract and its re-use in social media posts, if I understand correctly, but not the # of downloads.