No it's not lol. FNS has ass aim even for an IGL. Just compare him to Boo, Munchkin, JohnQT, Boostio or hell even Saadhak. All those people have way better aim while also being the IGL.
No one is saying that FNS should have t3xture level aim but he has by far the worst aim/mechanics out of probably every T1 IGL right now.