[Delirium-Zer0]

She didn't say FRIEND was the first song recorded EVER, she said it was first as opposed to poker face.

And the conversation in the documentary went roughly like this:
"I was recording my first single..."
"poker face?"
"Uh... yeah."

She did hesitate a tiny bit before saying "yeah" - mentioning NFN there woulda kinda killed the moment, given that she was talking about her grandmother's death at the time. She could have clarified that she meant debut single under the name "Hamasaki Ayumi," or she meant debut under avex, or whatever, but that woulda been a bit of a tangent and the momentum of the conversation woulda been lost. But you can tell she thought of mentioning it. Plus, officially, poker face IS her first single - because NFN was under a different name.

And I think it's more likely that the lyrics to LIMIT were ghost written. They're not really her style (sure her style probably changed alot between 1995 and 1998, but still), and to give her more "credibility" it's entirely likely that someone else wrote the lyrics to LIMIT, but she contributed a tiny bit so they decided to give her all the credit to make her look better. It happens all the time. I could believe that "poker face" were really the first lyrics she wrote all by herself.