Having watched the video, I'm fairly certain what is being observed is not really tiled.
I'm not however sure what a "tile-based immediate-mode rasterizers that buffer pixel output", but I think that's enough qualifications to make it somewhat meaningless. All modern gpu's dispatch thread groups that could look like "tiles" and have plenty of buffers, likely including buffers between fragment output, and render target output/color blending, But that doesn't make it a tiled/deferred renderer.
Having watched the video, I'm fairly certain what is being observed is not really tiled.
I'm not however sure what a "tile-based immediate-mode rasterizers that buffer pixel output", but I think that's enough qualifications to make it somewhat meaningless. All modern gpu's dispatch thread groups that could look like "tiles" and have plenty of buffers, likely including buffers between fragment output, and render target output/color blending, But that doesn't make it a tiled/deferred renderer.