Is this some new trend where websites include @media (prefers-color-scheme: light) and @media (prefers-color-scheme: dark) in their css, but it just breaks the

Is this some new trend where websites include @media (prefers-color-scheme: light) and @media (prefers-color-scheme: dark) in their css, but it just breaks the site? This site doesn't even have two themes, that css is just there to break the bold text!