defamatory? Raising enough questions about his birth in the US to keep him from being elected? That count?
So now you assume (but, of course, it is not a leap), that in 1991 this publishing house thought that Obama was going to run for president seventeen years later?
And, you still will not provide any acknowledgment to the fact that, regardless of what this website was saying up to 2007, Obama clearly stated in Dreams From My Father (1995) that he was born in Hawaii; of which, this publishing house provided the copy-editing and publishing.
Yet, you want to assert that what was stated by the publishing house in 1991 is in someway relevant.