I knew that someone would point that out..
But I figured most mathematicians are IT people, too. But there is at least also a third group: philisophers. They have formal logic, too (in university), but seldom math.
So in the spirit of the joke:
"Only to IT people though. "
Would have to be:
"Only to IT people and/or math people and/or philosophers, though. "
Desire for formal correctness satisfied?
But in this case there is actually a slight chance that nobody recognizes this as a joke at all...