In the example the two server communicate, this is the part "RoboFocus"@astropi of the start command of the second server, it indicate the server need to communicate with the other server on astropi when a client need to reach the focuser.

It can work if you can change the Asiair indiserver start command to add : "star2go"@star2goserver

If you cannot change the Asiair server options, this is a question only ZWO can respond.