I actually created that for my own use before the tutorial was available because I really dislike doing reverse relationship queries, really had nothing to do with making it easy to manage in the admin, that’s just a side effect. Almost everything I build has some type of relationship that needs to be displayed in both directions on the front end.
I actually only released it recently to the WP repo because is requires ACF5. I guess that’s a difference I missed, the plugin won’t work in ACF4 but you can code your own functions that will. I also have an example of coding this yourself that takes a different approach here https://github.com/Hube2/acf-filters-and-functions/blob/master/acf-reciprocal-relationship.php
