Absolute nonsense. You don't need a static site generator to serve up an HTML page instead of rendering with JS. People have been doing dynamic pages since before JS even existed.
The difference in speed between running a simple script and reading a file is not large enough to noticeably affect SEO.
Most of these sites are probably just using PHP, not any static site generator.
The difference in speed between running a simple script and reading a file is not large enough to noticeably affect SEO.
Most of these sites are probably just using PHP, not any static site generator.