Giftedness, talent, and genius can be evident even at age 4 year. Listen to Mozart's compositions K.1a through K.1d that he did at age 5 (which some scholars say were at age 4):

https://en.wikipedia.org/wiki/Nannerl_Notenbuch#Wolfgang_Moz...

I don't know how New York City's test works and if it really measures anything; maybe it's completely bogus. But it's a shame that you can't even talk about gifted education without it becoming a political liability.