by Scott Reilly on WordPress.org
Allow an admin user (when logged in) to always be able to comment on a post, even if comments are closed for the post.

A screenshot of the Discussion metabox when creating/editing a post or page that allows you to override the plugin to truly disable admin commenting for the post/page. This is the form field used for versions of WordPress older than 5.0, or for versions later than 5.0 when the block editor is disabled.
This plugin enables a user with the administrator role the ability to comment on any post or page, even if the comments for that post or page are closed. When the plugin is active, this behavior is automatically enabled.
Administrators can be explicitly prevented from commenting on specific posts via two approaches:
Links: Plugin Homepage | Plugin Directory Page | GitHub | Author Homepage
Developer documentation can be found in DEVELOPER-DOCS.md. That documentation covers the hooks provided by the plugin.
As an overview, these are the hooks provided by the plugin:
c2c_always_allow_admin_comments_disable : Customizes if comments should actually be disabled for a particular admin user.c2c_always_allow_admin_comments_post_types: Customizes which post types are supported by the plugin.