That’d be big if it actually pans out. Iowa wasn’t considered a battleground state, so I’m not sure anyone had it worked into a road to 270 model. (Iowa’s six electoral votes, if anyone’s curious.)
When you consider the average of all the opinion polls Trump is still more likely to win Iowa though he's hemorrhaging support there. What this means is that Harris has a real chance to win if people go out and vote.
First off, doesn't matter what the polls say, go vote. Second, this is a very interesting poll. In 2016 this was one of the few polls that predicted Trump would win IA. It also predicted he would win IA in 2020 too, which he did. That this poll is calling for Harris to do well this year lets me feel just a little bit of hope.
One poll means very little in a larger context. You have to look at the average of all Iowa polls and draw trends. Writing articles about single polls is just mindless sensationalism.