If you read the tutorial it is explicitly written the instruction to open port 10000/udp.
For the changes, in the tutorial I have linked the sources where the changes are explained,
since they are taken from the official documentation and just put together in this tutorial,
Also the configuration files are listed on github available for inspection from anyone.
And finally your are very much free not to use the tutorial :)
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If you read the tutorial it is explicitly written the instruction to open port 10000/udp.
For the changes, in the tutorial I have linked the sources where the changes are explained,
since they are taken from the official documentation and just put together in this tutorial,
Also the configuration files are listed on github available for inspection from anyone.
And finally your are very much free not to use the tutorial :)