Oh yeah I've seen that one. You may want to look at this one too: https://www.youtube.com/watch?v=0RbKb38rIvE&list=PL1fn6oC5ndU-S8BQkshYPO_yIQyT1yctU&index=2
You don't really need the switch or the cloud-key though.
Ubiquiti hardware won't have a built in web-server for configuration like most consumer router/AP do, which is what the cloud-key provides for you - an ip accessible device that has the controller software running on it. So it's not really necessary, you can just install the software on your laptop (or even a raspberry pi).
The switch is not necessary as the AP comes with a PoE injector included.
My time with the game spanned three variations. PS4 > PS4 Pro supersampling to 1080p on my old TV > PS4 Pro at 1440p upscaled w/HDR on my 4k TV.... It became increasingly more impressive with each upgrade I made, obviously, but even at base level it is a truly phenomenal visual achievement.