WordPress Multisite Sites show in Dropdown but not in Sites menu

Multisite is not for the faint of heart… You can easily find that when digging in its forum. And that’s an obligatory stop when learning WPMS. And you would surely received the same advice as the author of the tutorial you linked gives (my emphasis):

Editor’s Note:
Please note that for many users the excellent WordPress MU Domain Mapping Plugin is going to be a better solution. Our solution is really for expert users only.

Given that so many months have passed, you’d probably already solved this.

Anyway, the solution for the scenario you paint is to start from scratch. Maybe the tutorial works maybe not (it was 2+ years old when this Question was posted).
But there’s no need to reinvent the wheel when you have your back covered by such a plugin (just check who are the authors).

Resources of interest:

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