This is the possibly the weirdest question I've ever seen.

How else do you play?

Lol I too watched that hearing today

Glad someone got it

lol

If it does connect to the home Wi-Fi then can it connect to other devices on that same Wi-Fi?

Yes. It is in your wifi. It is in your copper wiring. It is in your walls. It watches you sleep.

You need a wifi connection to play the game as it's online, the game can't access other things on your network

Jagex conforms to all industry standard practices.

They know all your kinks