Web authors who fail to set their own browser defaults so that unstyled text is the size they like best do an extreme disservice to the users of the web pages they create by setting the size they prefer in their site styles instead. They're the reason why browser makers invented zoom & minimum text size.
You shouldn't need to zoom or unzoom this page. The text in these paragraphs is rendered using your browser's nominal default text size, and with standards-compliant color contrast and brightness. If they're not a good size for you, then you've negelected your responsibility to adjust your browser's default to properly suit your own needs and/or taste.