Make OTA work with Arduino Uno Wifi
What Arduino board are they referencing in the guide linked above, that we can just connect to out of the box?


The first Uno WiFi was made in 2016 by arduino.org. It is retired and not available in stores. 


  How can I get OTA support for my particular board?


The OTA support for Uno WiFi Rev. 2 is ready or almost ready, but the required additions are not merged in GitHub firmware and library repository even if they wait some months now. It looks like Arduino focuses on something else.