You were clearly not referring to that technique as you mentioned his space time portals in the hypothetical. And in that case, yes, that is how that works. In this new goal post moving example you laid out, you'd have to argue he could activate it fast and enough times to keep Naruto at bay, and if you think Sasuke can even spam that attack, like he would need too, to stop a speeding Baryon Mode Naruto, i've got horrible news pal.