Ending (SPOILER!!)

So I just finished the last episode and want to confirm something.

What originally happens is that the explosion happens and Arisu wakes up in the hospital and finds out Chota and Karube died. His brother also tells him he was in the borderlands for one minute because his heart stopped?

So does that refer to how time isn’t the same in the borderlands than it is in the real world? And does it also connect to why Karube and Chota died in the games?