Guessing you’ve never looked at housing in random farm towns? They all mooned in 2021 too except the really crappy ones.
It is shocking to see 30, 40k homes in perfectly safe areas, albeit in what feels like a ghost town. These tend to be small and run down but they’d still be 200k+ in a large metro and who knows how much somewhere like SF or NYC.
Plus it's shorter than saying "skyrocketed to an irrational extent, similar to what happened in the crypto market craze" and hence more expressive. Now, you might not agree that it quite did that to the same level as dogecoin, but that's a different matter than whether or not "mooned" is a good choice of words here. Personally I think hyperbole is useful and fun sometimes.