It's not the quantity, but rather the quality. At least on that vid shitty quality the hihats sound very thick, almost like a snare. But I guess you're right, there's almost a constant stream of 16ths percussion line underneath to roll it along.
search for rimshots, and glue rimshots with hi hats. Also rimshots + ghost snares. It's all about that believe me. Also static phasing effect into the hi hats and resampling these.