Mathematics is a precise business. We essentially have % uptake stats for live births with 78% of mothers refusing any covid vaccine. It doesn't actually say that 78% of mothers refused any covid vaxx. It says that of the mothers who had live births, 78% did not get a vaxx. It gave no information about mothers who had miscarriages.

Still, as I said from the beginning, I agree the data leaves lots to be desired. I do think it gives us a reasonable guesstimate of the Covid vaccine uptake % in expectant mothers, and in the worst case, it at least helps bracket the results.