Setting the toplines aside because internal, this poll is consistent with a trend left in PA. The same pollster just found roughly the same margins in PA and MN at roughly the same time. It's the one swing state I'm legit optimistic about for Biden, largely because it does capture some core NE "everyone went to college" suburbs.
It's not an internal. It's a joint poll conducted by an R pollster, Fabrizio, and a D pollster, Impact Research, on behalf of AARP. They had a series of them last cycle, where they were decent but not amazing.
Fabrizio operates alone for Trump, that is a lot different than in a joint poll, which is a pretty common setup for neutral polls to give them credibility across the political spectrum.