That's in the Xbox CE edition.
http://doom.wikia.com/wiki/MAP33:_Betray_%28Doom_II%29
"The Xbox 360 port of Doom II also contains Betray. However, it is not accessible due to the exit switch leading to the level being inoperable in MAP02 of the port"
this quote is why i asked.
if i had guess they removed becuase its not on the leaderboards but still surprising its there.
and i didnt really wanna dig out the xbox games