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Those steps outlined in the reference illustrate how to set up a new postgreSQL for use with django, assuming you have a fresh install and no users set up.
If you are running under a privileged account, like root, then it might be possible you have less set up to do for it to function. But the reason that guide exists is obviously because you must create an initial database, grant it access to a user, and then add the database name, user, and password to your settings.
In a nutshell, I would say that generally yes this process would be necessary. But follow that answer up with an I don’t know what your environment was before you started with django so possibly no.
If you can successfully read/write to that database via django, then I would wager you are done.