I believe that you have been given an adequate explanation regarding the new security policy for themes by the lead developer of the Hugo Project in this topic. Also here is the commit with the security policy change, in case you haven’t seen it.
I honestly think that you need to open an issue in the Themes Repo on GitHub about re-adding After Dark. This thread is not the place for that.
Also as you know the Hugo Themes website Build Script does not use NPM but Git repositories to generate theme demos.
Thanks.