That's nice, but I value text that renders at a legible size more than I value leaving the majority of my screen empty. This layout isn't effectively using negative space, it's just wasting the entire screen. At least on mobile.
You're free to call that "negative space", it's still 70% of my screen that's just blinding white, and 30% that's a tiny, non-responsive column layout. You call it perfect, I call it annoyingly empty and bad usability on mobile.