It might just be the terminology (and Naming things is hard): "Newcomers" feels either like one "Experience level" and/or implicitly a subset of "Wikimedia developers" (as it mostly seems to refer to dealing with code, and not being a newcomer in one of the other audiences).
Topic on Talk:Documentation/Audiences for Wikimedia technical documentation
Thanks @AKlapper (WMF) I removed Newcomers completely and moved some of the experiences and stories under other audiences.