Earlier quoted context omitted.
That's not the crazy part. The crazy part is arguing that building additional supply in response to that demand will _increase_ prices.
That's not all that crazy to me, I can imagine many scenarios where that could happen. The answer is, as always, "it depends". It depends on what you build, how you build it, where you build it, how it's perceived, the time interval across which you're measuring prices, etc. Price of stuff is way more nuanced than surface-level supply and demand. It all comes down to perception of value, and there are a LOT of factor…
It's disingenuous, however, to argue that this wiggling invalidates the crystal clear overall direction of the supply and demand curves or somehow invalidates the idea that the way to increase the amount of affordable housing is to increase the amount of housing.