I don’t think category moderators will appear in the group’s Permissions page. You should create a test account or use the Impersonate feature to check whether they can use these management tools on posts to verify if the settings have been successfully applied.
For example, here I created a group named Test and granted moderation permissions for a category. Even though there are no records on the Permissions page, when they click the show more button at the bottom right corner of a topic, they can normally see the delete topic and post admin actions options.
Settings in Security are what will be recorded here.
