Barry Kernfeld was the author, and the one who reviewed the tapes. The article appears on Kernfeld's website. Kernfeld's authorship and role in reviewing the tapes are confirmed by a David Wild-authored article which I found online today.
My searches revealed that this very article, verbatim, was reproduced in an Organissimo thread in 2005, entitled Amazing Coltrane Discovery. Peter Johnson and Jazzbo were among those who posted on that thread.