They're not the biggest club in the world by any measure, but, I agree, their pull is as big as big as it will ever be.
I still don't think Mbappé would have an interest in going there, though, for quite a few different reasons.
Not sure if this is what Bryant meant above, but, Werner is much more like Mané than he is Firmino; I'm pretty sure he'd play wide unless they changed how they set up radically. I don't think they could sell him and replace what he does for them easily, even if he's nowhere near as good individually as the two boys out wide.