When I first saw the title, I thought "great! Someone else has (re)discovered hypermedia".

But they have gone in a completely bewildering direction. Rather than swap/morph html fragments in, they're doing full page navigations and using view transitions to make it look smooth.

Worse, they are manipulating the history to cover these blasphemous tracks.

Datastar would make this particularly simple - just include whatever menu/nav stuff that you need and show/hide/toggle it with a few signals/attributes.