Have tried not to overread polls after 2020, but this is arguably the worst poll of the cycle for Donald Trump, I'd go as far to say.... Iowa is a state with high amount of white non-college voters and the topline suggests slippage with this group. Which also lends credence to the idea that her polling average in Wisconsin (around +3) may be real and not the phantom advantage we saw in previous election cycles.
It's also reflected a lot in some of the campaign choices she is making - her and Walz are spending time in places like Johnstown and Wilkes-Barre in PA, Wausau and Superior in WI.... they apparently must be seeing something internally that suggests they can shave some margin in rural areas, and this result suggests they may be onto something.
The final poll before the election tends to be the one that matters most and may yield a different result (that happened in 2020), but this one is a meaningful result regardless