How true is this map?

This article came up in my feed, and it gives birdwatching rankings for the states. I noticed, however, the northeast is just a barren wasteland, with only New York being in the top half of the country, despite the Atlantic Flyway going through this region. It also doesn't make sense that Virginia is 5, yet it's northern neighbor Maryland is 33 and Delaware is 49. So how true is this?

This article came up in my feed, and it gives birdwatching rankings for the states. I noticed, however, the northeast is just a barren wasteland, with only New York being in the top half of the country, despite the Atlantic Flyway going through this region. It also doesn't make sense that Virginia is 5, yet it's northern neighbor Maryland is 33 and Delaware is 49. So how true is this?