It always struck me as odd that they dispute a soul anyway.
They have a number of realms, like the Desire Realm, Form Realm, Formless Realm. This implies kinda an afterlife multiverse thing.
Perhaps what they mean is that the self doesn't really have any memory. We have a general idea of hammersklavier, but when hammersklavier dies he/she becomes hammerpiano, and after that maybe hammerdulcimer. All of them have similarities but there's more a sense of repeated patterns than a sense of "This is me, I am hammer."
There's a sense that you don't really have a soul that goes and keeps track of things, so you're stuck in stupid patterns that you don't even understand. Like, I keep getting in relationships but don't ever get to legit break up, we just move away. So today I sent a really nasty letter to a girl who had been treating me wrong before the COVID, but the damned thing hit before either of us could say "This sucks, let's stop talking to each other." I legit told her to go **** herself, and it felt sorta strangely satisfying.
There's a sense where we can't even remember our past. I think we're here to resolve these karmic problems and move beyond things. To move past our attachments. Sometimes there are definitely false steps. Like I'm honestly not sure I said the best things to her, but honestly things were very toxic to both of us.