I'm not sure I understand the title or introduction to this article. The paper being referenced is about a constant time single iteration quantum algorithm/circ

I'm not sure I understand the title or introduction to this article. The paper being referenced is about a constant time single iteration quantum algorithm/circuit(perhaps single gate? I didn't read too closely) that performs the Kravchuk transform. The QFT is already used all the time in quantum information processing. Many algorithms makes extensive use of it (including foundational algorithms like Shor's). And if we paint with broader strokes, a Hadamard is a just 2x2 qft matrix, so all problems in BQP that are solved by exploiting quantum parallelism use it.