Some Atheist-Antinatalists believe in this kind of afterlife...
For those antinatalists who find comfort in “eternal oblivion” (after death), their experience of comfort while thinking about no longer existing reveals that they’re not being merely poetic when they say things like "peaceful oblivion". It shows that they really do believe death will lead to an endless experience of peace. Why else would they feel comfort when thinking about no longer existing? What else could we call this but a belief in an afterlife?