I think the “technical” part mentioned here is a “local” tournament feature for Splatoon in the August update.
☆ NintendObs Weekly – Monday, July 27, 2015 – Sunday, August 2, 2015.
In Private Battle you won’t earn points, and your rank won’t be affected by wins or losses. You can also set a password on your lobby to ensure you’ll be playing with only your closest friends.
This gets a bit technical, but you can also arrange a Private Battle with eight Wii U systems connected to a router that’s in turn connected to the internet.
— Squid Research Lab
Source: Splatoon’s Tumblr.
At NintendObserver, the comments are on Discord.
Click on Community to learn more. 🙂
…
…Wanna play? Buy a Wii U.
And if you’ve already got yours, click on Splatoon for everything you need to know about the game. 😀