I need an expert to confirm this, but so far it seems it's a more aggressive hyper pattern combined with more aura milking and speedkilling midbosses for more filler popcorn. For instance, the player gets over 3600 hits in both 1-5 and 2-5, while the
best publicly available replay, albeit B-type, gets barely over 3000?that's a world of difference in WL. Then there's the endgame bonus for finishing Hibachi with full life stock, which is, I believe, at least 70 million higher than the current unassisted records. His way of bridging the stage 3 midboss is pretty cool, too; I don't remember if it's new, though.
I'm sure BL could be improved to 4 bil in TASing conditions as well.