that discussion is about multiple sessions on multiple VST connect instances on the same public IP…that’s not what you are asking
you are asking for 2 performers connected to the same instance of VST connect (?)
that’s definitely not possible and very unlikely to be made possible…
Think of it this way - there is a delay between performer and studio because of the speed of light / internet. That’s fine because Cubase/Nuendo/VSTconn can allow for it with only ONE time critical person (the performer) … it delays the studio feed so it seems like you are ‘in sync’. But if two people try to record at the same time, not even two Performer clients, but somebody in the ‘Studio’ and the performer…then they are not listening to the feed at the same time.
That’s the reason they put in a ‘rehearse mode’ - which tries to minimise the latency…(it’s still there of course!)…proper talkback is WAY out sync when you try to record.
Now add a 2nd remote performer to the the mix …everybody has a delay - nobody can play in sync with each other,
That’s why it’s NOT a jamming tool.
(hope all that makes sense)