Yeah, I don’t get the article that goes on about how ‘mountains don’t work like that’. These are mountains that were explicitly built into place by godlike beings, they aren’t natural formations that are a result of geological processes. And it’s not ‘we have some myths passed down in oral tradition and written down thousands of years later’ like a lot of Earth mythology, within the context of the books the events of the creation were written down by people who were there or talked to people who were there when it happened.
I’ve never understood the desire some geeks have to force science into explicitly fantasy worlds. It’s one thing to assume that real-world physics applies if the world doesn’t say anything about it, but when a work explicitly states that the mountain ranges were constructed by godlike beings it’s just absurd to deny it.