Never stated,that's headcanon. They only get revived by the source when they die.
You're the one whose saying a headcanon, it's not said that the Source revives them like you say while me just saying that vague thing is true. "Revive themselves" doesn't necessarily mean they do it by themselves, just that it happens, and that happens.
Its stated when gods die,they return to the source to be revived again (they are literally tied to the source,they need it's existence to revive).
You're the one saying that they're "tied to" the Source and "need" it to revive, as far as we know it can just be a habit they have, we don't know if going anywhere else makes it impossible for them to do the same.
Other/most characters type 8 are 100% similar to this.
Then try to chance the wording in the type 8 Immor., do not let it be vague and try to apply it to characters whose powers don't fit what it says.
If they can revive themselves,I don't see why they need any reliance to the source to return.
Plus,if they are dead how will they go to it by themselves? That doesn't even make sense at all.
The fact all gods have reliance to the source already makes it type 8.
Makes as much sense as any superpower, the gods and Darkseid go there by themselves somehow, I said that they do because it's stated that they did so, therefore it doesn't matter how you think it doesn't make sense. People would rather remove the agency characters have in walking to say that more powerful things help them if it makes things more OP.
Yeah. But then again by that logic what stops someone with an OP regen to have type 8 Immor. based on their own regen and body? It's always some ill-defined thing that makes it look like one has to go and destroy it while users claim the same when in reality looking at how things works for 2 seconds gives more simple alternatives. Here one just has to end the already dead gods before they go to the Source and be done with it, with no need for the Source itself to stop existing for the gods to die, that's excessive.
Same problem with characters with type 8 via some other character helping them out, can't a foe cut or intercept the communication? Can't it hax or "do something" to the helping character? The latter may just be some nonworthy thing not even close to making the character not exist anymore, yet it gets rid of the type 8 anyway.