I think there's some validity. I'd say the second half it was largely simply not making shots. Most of the first half, and not just threes, it was a bunch of out of rhythm shots. The ball was moving, but there was no productivity to it. Just swinging it around the perimeter without stressing the defense much, then somebody would finally jack up a three.
While it's also true that there's no way this team is going to shoot this bad again, it's also fair to say that any team that can put up 4% from three on that many attempts prior to Grill's last couple isn't a good three point shooting, and that's not changing in-season. Might they have their games where they hit a good percentage, sure, but they aren't going to hit threes consistently throughout the season. They just aren't. That's not who this team is, and that's OK as long as they adjust how they play. ISU has guys that are capable three point shooters, but there's a huge difference between capable and guys you can count on to shoot the three consistently. If they put up 25 plus threes every game they aren't going to win a lot of games.
Bolton can get to the lane and finish, draw fouls and knock down FTs. Haliburton is deadly in the two man game with Conditt and to a lesser extent Young and Jake. Nixon just needs to keep being a dog on defense and making life miserable for the opponents best perimeter player. Maybe Grill and Jackson can be those guys to provide some consistent shooting. Grill is athletic but still has a big adjustment on defense. Jackson has been really good on defense on the ball.
The pieces for a good team are there, but with some of the most common lineup configurations, the three just can't be the emphasis of the offense.