That poll is Miami-specific, but I can tell you what's happening on a wider level in FL. It's the same thing that has happened all over the country, but especially in states where the reproductive rights issues have made their way onto the ballots: it was wildly, wildly unpopular to overturn Roe and restrict those existing rights in any way, and republicans are going to pay massively for it. Firmly red places like KS, OH, KY have already shown the turnout waves it has created. This is an underestimated and under-polled population and it's going to show up huge.
As far as battleground states, reproductive rights are directly on the ballot in FL and NV. But the albatross is indirectly draped around the neck of every republican on every state's ballot, and I've been saying that even a cardboard cutout of Biden could've won this election, even after the debate disaster and ensuing media/pundits panic. It seems like only me and that one presidential historian who makes the predictions still feel that way.
But now that part is moot, and where Biden would've just edged by, Harris has energized people in a way that is going to make it a total beatdown. The convention bump hasn't even come yet. By Nov 5, it won't be close.