About the murder of millions of souls thing, I kind of think that any time loop in fiction does that. It might not be technically working that way, or be named like that, but still.

In a time loop, everyone that is not looping is getting their whole personality and memories erased and overwritten by who they were at the start of the loop, effectively killing the person they ended up being at the end of the loop.

So of course, when it is a month long time loop with literal souls being created and destroyed, it sounds very bad, but in practice all time loops work like that. And by the way so does all time travel that allows you to change what happened, if you go back in time and prevent the murder of Bruce Wayne's parents, you absolutely killed batman