It's either a glitched or hacked.
There's also some levels that has impossible Naija times, which usually means they accidently bugged through a wall. I know I have 0.52 on 1-1 and naija just flew through the platform where Bandage girl is.
VVVVVVV can also bug through ground. There's one level where he bugged through for me.
Well, all character can bug through walls etc, if you have ram-lag or HDDlag the game continues while the frame is freezed and you will often end up dead, but sometimes it helps you. But please don't enter the goal if that occurs ^^
It's more than possible to get a rather low time on 1-1 with naija without walling. I have a .7 iirc.