You could just as easily say that Python (one of the languages listed as non-puzzle) is a puzzle language because it lacks goto, so you have to puzzle out ways to model your control flow and looping into the more rigid while-loops, for-loops and if-else-branches. "I want to execute this block at least one time, but not necessarily the second, and I have to check these conditions here, but I have to declare the boolean variable over here... Oh my kingdom for a goto!"