Stefano4444
He/Him- 6,206
- 5,335
I mean Goku and Pikkon did travel to Hell by flying from the Grand Kai Planet, and is not like it was stated or show that they go to King Yemma's palace first or that they teleported via IT.The fact that you cannot physically travel to Hell supports it being a separate space-time.
Also i have yet to see statements in the series who directly conferm that Hell its separated space-time (or that the yellow clouds separate space-time), we have statements for the Afterlife and Kaioshin Realm sure but the same can't be say for Hell.
The closest one it come in mind its the one from DBGT (about the two Android 17's portal was connecting separated space-times) but considering that Hell is part of the Afterlife which by itself its a different space-time it doesn't necessarely conferm anything.