Not really sure that follows. For a 20ft room, it only takes a wifi signal 20 nanoseconds to cross it, and an ethernet signal around 30 nanoseconds. Your room would need to be over a hundred miles wide to add a millisecond of delay, disregarding stuff like repeaters.
I think the same room is to have good signal strength to minimize dropped/repeated packets. The transmission time won't be noticeable but the signal to noise ratio may decrease fairly quickly with distance and obstacles.
It feels magical, in a way that feels like it must be cheating and the spell is going to break anytime... yet it doesn't.
To pre-empt a few of the obvious asterisks:
- "No latency" is physically impossible. If you play twitchy music rythm games you will indeed manage to notice.
- You must have a good wifi ac router.
- Your gaming host must be wired to that router.
- To minimize network hoops, all of this should happen in the same room. Every milisecond counts.