Three minutes of google shows he has posted at other sites, poker related and other using his Rx username. What does that prove ? Nothing except his rx persona is consistent with some other internet footprints.
Then... look at the wsop thread... I could be mistaken but I am fairly sure other posters (at least one) claimed to know who he is and promised not to reveal his name. I recall awm saying he writes for a poker site and preferred not to have that other site get wind of this thread. Finally... he was posting about interviewing job applicants and I seem to recall a few posters making contact with him in pursuit of employment.
I think some regular posters know him and something will be said soon on awm's behalf.
Then again... maybe this is the twilight zone