I guess that's one definition of static webpage. My understanding was that static webpages are static. Meaning it has no dynamic content and that everyone accessing the static page sees the same thing.

If dynamic content is client side driven, it wouldn't be "static" as each client could see a different page.

For example, even if you your webpage just displayed the client side time, it would be dynamic since people in different time zones will see a different time regardless of the time being generated on the client side.

Whether it is a static class or a static webpage, static has a well established meaning in the CS world. But I haven't done web development since college and it is possible the meaning of static webpage has changed as technology changes.