Since April Fool's is over here is the explanation. I am forcing a reset using a glitch where if you input UDLRB when you have 0 kunai the game resets. In 1-1, I also use an obscure glitch where if you kill the ninja dog and then in a area where he died use a kunai, the kunai disappears. I believe what happens here is that the ninja dog's abiity is to "catch" kunai and make them disappear so I think the game is not cleaning that hitbox for that effect here. In the normal TAS this trick is not shown off since it loses time. If you watch the kunai count you will see a spot where it decreases but no kunai comes out around 0:46. The Ninjitsu use when you are inside the ceiling is a strange beast. The game pushes you left but then resets your position when you done. However if you do this where there is something that can damage you like the moving blocks in 7-2 after using Ninjitsu you just die once it is complete. Here I just force a reset after it is done to make it look more spastic.