Well the point is that you don't have to set up anything or use another open source tool. You don't need to run this platform in your own cloud, it just prepares your cloud for you. For example you want to run your dockerized applications, now instead of using Heroku which runs your workload on their platform, this one runs it on your own cloud account as if you had a DevOps guy do it for you.
Dokku is basically what you described. Its not hard to set up & that its open source and has commercial support is even more attractive.
I'm a bit skeptical something could be easier to install. You go to the dokku homepage copy and paste the command on your server and its done.