I would be more concerned about the roots. At eight feet tall it is highly unlikely they dug it up without doing massive damage to the roots. Persimmons do not recover well from root damage. See if you can pull it out of the pot and inspect the roots. If they look good there is a good chance of outgrowing the upper problems when it gets established. To me it is all about the price. If cheap enough just gamble on it.
I would still focus on the roots. If it can be pulled out of the pot you should be good to go. If it does not want to pull out and feels like the dirt is giving I would let it go. Many trees will leaf out and fruit as their last effort to replicate before dying. Price is about on par for the size potted. Piece of advice from my experience. It is better to start with a smaller undamaged root system than a much larger tree with a damaged root system. The small tree will over take the larger one in 2-3 years.
For whatever reason how it grew this horrible intersection and this is the only problem with the tree except for any disguised (unintentional) root-issues, this tree would need cut below the entire intersection that is showing “seeping rot” and retrained into a new-tree, again.