Hello @ressa
This module is created to make config export ignore when we use ...

Hello @ressa
This module is created to make config export ignore when we use config_split and we are exporting via particular config split.
You can try by drush csex command, it shouldn't give the issue.

Also, as per the recent migration API changes, we no longer need migrations as config entity.
You can write in your module's migration directory and it won't be imported as configuration.
For ex: if your module name is "content_import" then migration files can be kept here at "content_import/migrations" directory.
That way, you won't have to worry about dealing with migration on config export.