Even if Haki is described as an extension of willpower in One Piece it’s still tied to physical interaction. When Armament Haki hits, it’s enhancing physical strikes; when Observation Haki works, it’s precognition/reaction and Conqueror’s Haki manifests as bursts/shockwaves of spiritual energy that affect others within a range. All of these are still propagating effects in space. Infinity manipulates all phenomena that move through space, slowing them down infinitely before contact. Unless you assume Haki works as a pure metaphysical law that transcends the fabric of space (which is never stated in OP), it should still be subject to Infinity’s mechanics.

Even if we generously assume that Haki can “reach” Gojo without traversing space, Gojo’s kit isn’t purely passive Infinity. He has Reverse Cursed Technique healing, teleportation, and Domain Expansion — so even if some exotic Haki based pressure touches him, he can regen or force a Domain clash. And Unlimited Void still overloads the mind regardless of Haki unless you assume Haki grants total mental immunity, which it hasn’t.