Yitz: Calling it a dream or a Remez or an allegory is the same basic thing. It means you learn something from it but accept that it didn’t happen. He’s answering it the same way the Rambam would.
And that story is nice, but it doesn’t make any sense. The Rambam wrote a ton and referred to some Kabbalistic literature (Shiur Komah). He rejected all of it. I find it very, very hard to believe.