This is the opposite of how most goods behave - as prices rise, demand falls off.
The writer is talking about different types of goods. It's common sense right from the beginning that BTC wouldn't behave this way, because it has scarcity - therefore a higher price means that there is higher demand for it at that particular time.
In the case of Bitcoin, it seems clear to me that we are in a stage where rising prices fuels further demand - like a Giffen good.
What it's like is a speculative bubble. It's at a point where no price increase will make people think it's too high, and most people buying in are self-aware enough to know that they are looking for a "greater fool" to buy at a higher price than them.
The article is trying to make BTC appear invincible, as if these prices increases are an inherent feature of BTC that will continue and perhaps even multiply in time, but it seems extremely unlikely that this will come true.
