You aren't wrong that lore would allow for anything once written. Regardless, at the moment it is only saying one thing. If during "the Death of Superman" comic book, I said Superman was dead. I was right (but only for a short time).
What part of interpretation does "The Brume" leave open for? And it really wasn't sarcasm... Sarcasm would be me saying "Oh we should all live in the Brume! It would be fun!" I just said that the lore afforded us only one place to go. I only added a edit below my "Edit:" part, everything above that was already there.
