I'm puzzled why Biden is trying to expand the map at this point. There are 5 states that flipped from 2016 and Nevada, he should focus on those. If he couldn't get a landslide in 2020 when the country was in recession, Trump was more unpopular than ever, and Biden himself had better favorables, he isn't going to get one now.
Biden winning NC is not implausible, and Biden underperforming his 2020 margin nationwide is far from a forgone conclusion. While Biden needs to focus on securing the MI/PA/WI trio + AZ, attempting to flip North Carolina for a more secure finish wouldn't necessarily be a bad idea (even though I still think Georgia's stronger for Biden than North Carolina is).
But aside from that, Democrats would be foolish to waste time and resources in any of the other Trump 2020 states (and Trump isn't winning any state he lost to Biden by over 5% the first time).
