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It’s a bit more complicated than that. This is their product Browser Rendering, which runs a real browser that loads the page and executes JavaScript. It’s a bit more involved than a simple curl scraping.
The interface also allow to comment, post and interact with the original HN platform. Credentials are stored locally and are never sent to any server, you can check the source code here: https://github.com/GabrielePicco/hacker-news-rich.