Using apa6 version (biblatex-apa6 v8.5 (2020-08-30)) with biblatex v3.15a (2020/08-30) and Biber 2.15 produces the same warning:
Package biblatex Warning: The starred command '\DeclareDelimAlias*' is
(biblatex) deprecated.
(biblatex) Use the unstarred version '\DeclareDelimAlias'
(biblatex) instead.
Using apa6 version (biblatex-apa6 v8.5 (2020-08-30)) with biblatex v3.15a (2020/08-30) and Biber 2.15 produces the same warning:
Originally posted by @h4ppyM in https://github.com/plk/biblatex-apa/issues/125#issuecomment-751475529