If anyone wants to see a recording of the demo, click on the "Boo!" link in the article to view its entry on the CSDb site. The blue sidebar on the right has a YouTube link.
The new technique enables a bigger cube at full frame rate. From the article:
> “Apart from unlocking a number of improvements in XOR fillers and similar effects, the method, as used in the 4k, also significantly raises the bar for realtime filled sprite vector cubes. The cube displayed in "Boo!" draws over an area of size 172x172, up from 140x140 in Protogeo 100%. This improvement to size is because line computation that previously either took 7+ cycles per pixel (or exhaustive amounts of memory) can now, thanks to the BRR ("bit reverse rendered") line method, done in just 5 cycles per pixel.”
Here's the non-size-limited competition winner, for the curious. It's freakin' incredible - and 23 minutes!, but you can skip from 5m - 8m (I think extended for music):