This is the entity-type that the comment 'field' will "attach" to, the field is poorly described
If you select 'content' here then when you add the 'comments' field to your node/entity you will be able to select 'content' there too
What is the use of comment type, when we select target entity "comment" during creation of a comment type?
URL: site-url/admin/structure/comment/types/add
How can we use comment within a comment type?
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
This is the entity-type that the comment 'field' will "attach" to, the field is poorly described
If you select 'content' here then when you add the 'comments' field to your node/entity you will be able to select 'content' there too