So, I think there is another angle to this that most people aren't talking about.
The way people talk about gods in thread, it seems pretty accepted that belief shapes capability and, to a degree, motivation of gods.
The Dwarfs have declared that Ranald doesn't just steal souls, but that he does it often enough to play silly buggers by doing things like sticking dwarfs in humans.
What does that imply about the souls of people sacrificed to chaos or to some druchii's dark ritual?
To be clear, I think that if Ranald could steal those souls from chaos or destruction, He would have been doing it already. But the God of luck needs opportunities, and desperate people who hear about the god who steals souls are going to be looking to give those opportunities.
How many people changed by warpstone are going to hold out against chaos better, because they
know Ranald has pulled this con before? How many parents are going to steep their mutant kids in Ranaldite lore, because the alternatives are leaving them in the woods or burning them alive? How many people in Hashut slave pits have been taught all their lives that they belong to Hashut and that even death is no escape might decide to charge their masters with a fire in their eyes and a cry of Ranald on their lips, because what do they have to lose?
Again, I think this is already happening, not often, but happening without us. And I don't think that this incident will make the above common, but I do think that it will make it more likely, and here is where it gets funny to me.
If leaning into the lie makes the above more common, you could argue that doing so isn't just approved of by Ranald, but obligatory. And of course it would be downright unpious to not take full advantage of any benefits of doing so.
TL

R - The proper response to this nonsense by Mathilda is to think it's bullshit but roll with it anyway and you can't convince me otherwise.