It's humour because the "halting problem" has a simple and elegant proof that it is impossible to solve in the general case. TFA's request for general computing to use unlimited stack operation for every thread of execution is equivalent to a call for the halting problem to be provably possible in O(1) time. It's the unexpected juxtaposition of these two oppositional ideas that provides the basis for humour.
Of course, if it has to be explained it loses its funny.
Of course, if it has to be explained it loses its funny.