I thought it was very odd. It made me wonder if he did not actually hit the bar and the tester was trying to get him in anyway. The school clearly believes he is gifted and probably would like to "hold onto" him.
I know of several children personally who "flunked" this screener on the first try and went on to score strongly gifted on a full WISC. It may have low reliability. They only take one section and it's like a 20-min test or something. I did not receive the score (I don't think I ever will--my other child took the same screener and I never got a score).