iZone Bridge for a Ducted AC retrofit

I'm looking at retrofitting a very early implementation of a MyAir / Advantage Air ducted AC controller that has no external connectivity. Looking at iZone hardware, refining what the shopping list might be and wondering;
Does Hubitat need the iZone BRIDGE (that connects to your router) to talk to the system, or does it talk directly to the iZone (C150) Controller?

A Sample kit; iZone 155 Naked Kit iZone - Online Store
... ultimately I really only need a remote On/Off for the A/C ... but that might be a challenge with the weird hookup of my system.

You would need that bridge device, and a Hubitat driver written to interact with the system.

OK, I guess thats what this driver code snippet means.