This is actually an old story, which I thought had gone away after it was discovered he turned the whole thing into a hilariously-bad piece of gonzo journalism for his masters thesis.
I remember it too. Might even be 2 years old now. I listened to a radio panel discussion centering on the Tim Adams "revelations" at that time. Wish I could remember the show/date.
Adams, who claimed to have been some manager in a records office of the Hawaiian govt, was attacked by the four other "birther" panelists as being untrustworthy. Basically, he and his story fell apart. It was obvious to me at the time that he was simply regurgitating commonly available internet lore. The 2 hour discussion went quite weird near the end with the scatter-brained Adams' back-peddling and contradictions, and another panelist's foray into the world of white supremacists.
That radio show weirded me out and, as a result, I have no confidence in Adams, nor his story.... whatsoever.