I'm pleased to see that the Presidents Project has improved the quality of some of the data on Presidential ancestries.
I didn't check the status all of my Presidential relationships, but I did check several of the ones that I had thought were dubious. I found that my supposed relationships to James K. Polk and Ronald Reagan have "gone away," while Herbert Hoover has gone from being a dubious relationship to being a president with whom I share multiple ancestors on lines that appear to be reasonably well documented (for both of us).
So I see a great deal of progress by this project! Congratulations and thanks.