They rated it as mostly true actually - https://www.politifact.com/factchecks/2014/jul/29/facebook-posts/are-97-nations-100-poorest-counties-red-states/ and https://www.politifact.com/factchecks/2014/mar/28/occupy-democrats/pro-democrat-group-says-9-10-poorest-states-are-re/ but you’ll notice they’re from 10 years ago… probably not much different, especially after our last president…

I think these are the articles:

• "Nine out of the 10 poorest states are Red states."
• "97 percent of the 100 poorest counties in America are in red states."

but, to add nuance, it doesn't really tell you much about cause and effect. It's not a lie but it's a pretty hard conclusion to draw from a few figures.