I'll take your word for it. I tried to go to that link and couldn't get access, but I believe you.
I think the mother is just trying to sell a book.
http://en.wikipedia.org/wiki/Jeff_Gannon - offer made but it looks like he has never done it.
Johnny Gosch, a 12-year-old Iowa boy who disappeared in 1982. On July 8, 2005 Gannon called into the radio program A Closer Look hosted by Michael Corbin and agreed to take a DNA test to prove he was not Gosch; he has not taken as of yet taken the test, though the offer has been renewed by Gosch's mother Noreen [1] and occult author William H. Kennedy.
Wow. That's pretty harsh considering you don't even know Noreen. You have no idea what she has gone through & is still going through. If my child was missing, I'd do all I could to find him. She's not trying to "sell a book". She's trying to keep this story out in the public eye. You would do no less for your child.