Looks like those only show observations that are annotated as “alive” or “cannot be determined”, rather than all observations without a “dead” annotation though.
without_term_value_id=19 (dead) doesn’t work on its own, i.e. to show both unannotated observations and also those annotated “alive” or “cannot be dermined” / excluding “dead”. Relevant convo here: https://forum.inaturalist.org/t/identify-filter-without-annotation-not-working-properly/30148/