How are you? now I am facing the same issue.
But I can't install dev public app to real store in your way. (enabled on only dev store).
When I tried to install dev public app to real store, I was provided the below error.
"This app needs to be reviewed by Shopify before it can be installed. Contact the app developer for more information about this app."
Do you have any other solution? How can I pass this step?
I built app according to this link