Yes, and even though it's not authenticated, it did support the first plaintiff's argument.
The first plaintiff simply says that since Obama's father was not a US citizen at the time of Obama's birth, he can't be a natural born citizen.
The attorney entered the digital copy of the BC as a evidence from Obama (or at least a representative of Obama) that his father was not a US citizen. He also quoted Obama's book, in which he tells a story about his father that would exclude him from being a US citizen.
This is really little more than introducing testimony from Obama as evidence. It doesn't actually determine whether it's true or not.