Given these skins have their own native night mode under implementation, we should stop the extension applying to those. The two are in conflict.
We can re-assess closer to the release to make sure we don't disrupt the night mode experience.
This decision came out of this discussion:
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/DarkMode/+/994817/comments/ef602a85_d7f9d908