As I've been a 2D animator for most of my professional video game career I can say that the video is perfectly feasible without "little tricks" to make animation and work go faster.
And as a side-note, his first video was much prettier and better animated, and less "horny anime nerd and panties".
I think also the grey scaled colour choice in the first one was superior to these colours. Somehow black blood looks way more gory and good than bright red.
Soo, if you watch this and haven't watched the first one, go look for "Pirate Baby's Cabana Battle Street Fight 2006"!